View Full Version : Project Break My Colt 6720 (pencil barrel).
The Dumb Gun Collector
02-07-17, 20:25
Hey guys,
As some of you know I enjoy keeping notes on shooting my various guns. I started doing this over on HKPRO with my P2000 and then HK45. I have done a few more on J-frames, Wilson combats etc. I am not actively trying to destroy the guns, it is really just a collection of experiences and data points. One thing I have never done is really keep up with my rifles. I sold all my assault rifles a few years back to make some money during one of the various panics so my oldest current AR is this 6720. It is my training carbine and I basically treat it like garbage. I have another 6720, a DD LW, SCAR-17 that I baby, but I don't clean or do much for old Mildred.
Here are things I have changed.
Of course I added a T-2 as soon as I could. In fact, I found the T-2 for a good price and then I bought the rifle to have something to put it on. Then I bought one of the magpul SL forends because I originally planned to skip rails. I put a Arisaka Scout light on it, DD rear sight, vickers sling BCM stock and probably should have kept it here...
https://c1.staticflickr.com/1/411/20034843745_d6ed3dc6a0_k.jpg (https://flic.kr/p/wwpP3r)Untitled (https://flic.kr/p/wwpP3r) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
Well, because I am an idiot I decided I needed a keymod rail. I picked up one of the DD rails and grinded down the front sight post like an idiot. What a bunch of hassle. I would totally go with adco to shave down the FSB next time. After I put the DD rail on I then stripped out the screws like a dumbass and had to wait for replacements. After that I bolted on a DD front and put an old X300 I had laying around. This is how it looked for most of its life...(at some point I swapped the T-2 onto my DD and put an H-1 I got on sale onto Mildred....
https://c1.staticflickr.com/1/557/31960637693_d1aabebc17_k.jpg (https://flic.kr/p/QGfC6t)Untitled (https://flic.kr/p/QGfC6t) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
Well, I got bored with it a month or two ago and spray painted it....
https://c1.staticflickr.com/1/546/31196727284_62085bb30c_k.jpg (https://flic.kr/p/PwKo9m)Untitled (https://flic.kr/p/PwKo9m) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
And now I added a BCM forgriq, pistol grip and an aim point cover so I could just be a complete Larry Vicker's fanboy. I am just figuring out where to put it so I haven't put my keymod covers back on the bottom yet. I have resisted fore-grips for decades but here it is....
https://c1.staticflickr.com/1/423/32581820552_b9c8ee3b04_k.jpg (https://flic.kr/p/RD9m7L)Untitled (https://flic.kr/p/RD9m7L) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
At this point the carbine has 3352 rounds through it. This includes Various types of 55 grain XM193s, 855s, 77grain CBC, and a mother crap ton of steel cased TULA and Monarch ammo. For the last 800+ rounds I have stopped cleaning it because I am lazy. I still spray rem oil on the bolt and work it back and forth.
The gun functions perfectly and...wait for it...has never jammed. I am sure someone will call BS, but it just hasn't. I have a buddy who is into AKs and is constantly telling me about how reliable they are vs ARs and I keep asking him when he can recall on of my AR's jamming. At some point soon this one will because I have decided not to clean it until something stops working.
I wish I had recorded a series of groups with it when I first bought it but I didn't However, I have done a series of groups recently with
American eagle Xm193 3 groups of 5@ 100 yards (3.6 average)
CBC/Magtech 77 grain 3 groups of 5 @ 100 yards (1.42 inch average)
All groups shot off Caldwell shooting bag.
Before you scoff at my pitiful groups remember 1. I am not a ninja, 2. these groups were shot with a 2moa dot, 3. this has a mil-spec trigger, 4. I don't cherry pick or toss out fliers.
I will continue to shoot about 200 rounds a week of steel through it and try to monitor the groups with the steel stuff over the months.
Solid set up. Hate the rail gets so much crap for Design / movement as of late. Suppose DD should go to RIS II attachment.
Greg, Is there a reason that you stuck with the pencil barrel? Is that simply because you didn't wish to change out the barrel or do you prefer the pencil barrel?
Greg, Is there a reason that you stuck with the pencil barrel? Is that simply because you didn't wish to change out the barrel or do you prefer the pencil barrel?
He must like it if he not only kept it but got a second as well.
Sent from my iPhone using Tapatalk
The Dumb Gun Collector
02-08-17, 08:09
Rocket,
Yeah, I'm lucky I just locktited mine and used proper torque settings so mine hasn't moved. I do keep an eye on it though. My DD rifle has the same rail and it hasn't moved--but it gets very light handling as compared to the neglectful treatment this rifle gets.
I love pencil barrels! Nice and light! I am 43 so I really don't like too much extra weight.
Greg, why do you feel that the slight reduction in weight is beneficial? When one adds lots of accessories to an M4, I personally don't notice much difference due to barrel weight. Given the potential issues with barrel harmonics and barrel flex when using a sling, I sort of favor a heavier barrel. Perhaps that's just me.
friendlyfireisnt
02-08-17, 08:39
Greg, why do you feel that the slight reduction in weight is beneficial? When one adds lots of accessories to an M4, I personally don't notice much difference due to barrel weight. Given the potential issues with barrel harmonics and barrel flex when using a sling, I sort of favor a heavier barrel. Perhaps that's just me.
It's not such a slight difference, once you feel it. And once you add in a light and a VFG, it's still going to be lighter than a Gov't profile with the same accessories added.
And before someone says that lightweight barrels aren't accurate, there really isn't much of a penalty, as shown below.
https://c1.staticflickr.com/2/1640/25863378035_116b20076f_z.jpg (https://flic.kr/p/FpszdX)DD American Eagle Varmint (https://flic.kr/p/FpszdX) by Photographer Pilot (https://www.flickr.com/photos/138264913@N04/), on Flickr
Doc Safari
02-08-17, 09:27
The gun functions perfectly and...wait for it...has never jammed. I am sure someone will call BS, but it just hasn't. I have a buddy who is into AKs and is constantly telling me about how reliable they are vs ARs and I keep asking him when he can recall on of my AR's jamming. At some point soon this one will because I have decided not to clean it until something stops working.
My every day shooter BCM has had only one malfunction (when it was new) in nearly 6,000 rounds, so I believe you.
I keep it lubed regularly, but I've only cleaned it on rare occasions when I think it's gotten the desert sand in it.
So your experience is no surprise to me at all.
It's not such a slight difference, once you feel it. And once you add in a light and a VFG, it's still going to be lighter than a Gov't profile with the same accessories added.
The weight difference is approx. 1/2 lb between the original M4 barrel and the later heavy barrel. I personally don't think that is all that significant in the overall scheme of things. Of course, that is just my opinion.
I don't deny the accuracy of a light barrel under ideal conditions. However, if you are employing a sling for stabilization, the heavier barrel resists barrel bending and that phenomenon has been well known since the early days of the M16 rifle. With a light weight barrel, our POI can change based on how much sling tension is on the rifle. That's one of the reasons that match rifle shooters who use AR platforms like free floating handguards.
pyrotechnic
02-08-17, 11:01
The weight difference is approx. 1/2 lb between the original M4 barrel and the later heavy barrel. I personally don't think that is all that significant in the overall scheme of things. Of course, that is just my opinion.
I don't deny the accuracy of a light barrel under ideal conditions. However, if you are employing a sling for stabilization, the heavier barrel resists barrel bending and that phenomenon has been well known since the early days of the M16 rifle. With a light weight barrel, our POI can change based on how much sling tension is on the rifle. That's one of the reasons that match rifle shooters who use AR platforms like free floating handguards.
The 1/2 lb being out front makes a difference in how the gun handles, even if the overall weight change isn't that much. Also, the standard government profile puts extra thickness in front of the fsb where it doesn't do anything to benefit you.
With free float handguards sling tension is a non issue, unless your using irons and slung up so tight you're deforming the handguard.
You're going to get bored of this, Greg. I tried it with one of my BCM's, but I got tired of how bad the rifle smelled after so much steel-cased ammo and how much carbon it left on whatever it touched.
It's like sharing a bed with an outside dog.
The weight difference is approx. 1/2 lb between the original M4 barrel and the later heavy barrel. I personally don't think that is all that significant in the overall scheme of things. Of course, that is just my opinion.
I don't deny the accuracy of a light barrel under ideal conditions. However, if you are employing a sling for stabilization, the heavier barrel resists barrel bending and that phenomenon has been well known since the early days of the M16 rifle. With a light weight barrel, our POI can change based on how much sling tension is on the rifle. That's one of the reasons that match rifle shooters who use AR platforms like free floating handguards.
Really sticking to this cause, aren't you?
556BlackRifle
02-08-17, 11:39
You're going to get bored of this, Greg. I tried it with one of my BCM's, but I got tired of how bad the rifle smelled after so much steel-cased ammo and how much carbon it left on whatever it touched.
It's like sharing a bed with an outside dog.
Really sticking to this cause, aren't you?
Warning! Don't sip hot coffee while reading Inebriated's post!! LOL :)
Ounces quickly add up to pounds. As someone already mentioned, it makes a bigger difference out front. Also, when it comes to balance, sometimes adding batteries to my stock actually makes the carbine feel lighter. I know this is not true, but the handling characteristics make it seem so. However, if carrying the carbine for hours on-end, I'd prefer it to be a light as possible overall.
The weight difference is approx. 1/2 lb between the original M4 barrel and the later heavy barrel. I personally don't think that is all that significant in the overall scheme of things. Of course, that is just my opinion.
I don't deny the accuracy of a light barrel under ideal conditions. However, if you are employing a sling for stabilization, the heavier barrel resists barrel bending and that phenomenon has been well known since the early days of the M16 rifle. With a light weight barrel, our POI can change based on how much sling tension is on the rifle. That's one of the reasons that match rifle shooters who use AR platforms like free floating handguards.
jackblack73
02-08-17, 12:35
The weight difference is approx. 1/2 lb between the original M4 barrel and the later heavy barrel. I personally don't think that is all that significant in the overall scheme of things. Of course, that is just my opinion.
I don't deny the accuracy of a light barrel under ideal conditions. However, if you are employing a sling for stabilization, the heavier barrel resists barrel bending and that phenomenon has been well known since the early days of the M16 rifle. With a light weight barrel, our POI can change based on how much sling tension is on the rifle. That's one of the reasons that match rifle shooters who use AR platforms like free floating handguards.
It's clear from the pic that the barrel is free floated. And the extra weight is out at the end of the barrel, so it basically serves no purpose but to make the rifle more unweildy.
The 1/2 lb being out front makes a difference in how the gun handles, even if the overall weight change isn't that much. Also, the standard government profile puts extra thickness in front of the fsb where it doesn't do anything to benefit you.
I would suggest that you look at the M4 vs M4A1 barrel profiles before you state that the weight is all forward. The M4A1 barrel has much greater thickness rearward of the front sling swivel. I really like that feature since it adds barrel rigidity. I know that the Ordnance Department made the change to better handle sustained automatic fire but there is an added benefit of increased barrel rigidity. All one has to do is watch Larry Vickers high speed video of him firing an M4 to understand how much barrel deflection occurs even during firing.
The Dumb Gun Collector
02-08-17, 18:50
Hey Rick. The DD rail is freefloating and has integrated sling mounts. No need to worry about sling issues. I used to have heavy barreled ars but for my purposes a pencil is just more enjoyable. I really like the pointability of a pencil barrel. I have several 6920s and the difference is very noticeable when transitioning from target to target. Just my preference! As you can see even filthy the gun is nearly moa with magtech so it is plenty accurate for training and non precision rifle duties. Gotta get one dude!
Hey Rick. The DD rail is freefloating and has integrated sling mounts. No need to worry about sling issues. I used to have heavy barreled ars but for my purposes a pencil is just more enjoyable. I really like the pointability of a pencil barrel. I have several 6920s and the difference is very noticeable when transitioning from target to target. Just my preference! As you can see even filthy the gun is nearly moa with magtech so it is plenty accurate for training and non precision rifle duties. Gotta get one dude!
Greg, That makes sense to me. Each of us do have our own personal preferences and I respect that.
The gun is capable of headshot at 300yds, plus, is reliable, and lightweight.
Winning!
Precision guns are cool, but it's difficult to justify for me when a heavy duty cr lined barrels posts sub 1.5 moa groups consistently. Time and place I guess.
The older I get, the smarter I think pencil barrels are. The last 7 AR's I bought for my department were 6720s. They're never going to drive off hordes of taliban on full auto in Afghanistan, or ever shoot full-auto at all. They're plenty accurate, and are just as reliable as the 6721s and 6920s we bought before. After adding all the "lightweight" gear up front, they get pretty heavy when you carry them for a long time. Franly, I wish my issued rifle was a pencil barrel. Light makes right in my world.
I'm a big fan of lightweight barrels, too. My LW Sionics upper w/ a Surefire M951 and Geissele rail is so much more nimble to handle than my rifle-length LMT MRP w/ a Surefire M600.
The older I get, the smarter I think pencil barrels are. The last 7 AR's I bought for my department were 6720s. They're never going to drive off hordes of taliban on full auto in Afghanistan, or ever shoot full-auto at all. They're plenty accurate, and are just as reliable as the 6721s and 6920s we bought before. After adding all the "lightweight" gear up front, they get pretty heavy when you carry them for a long time. Franly, I wish my issued rifle was a pencil barrel. Light makes right in my world.
How are your department ARs set up? Just curious, thanks.
The Dumb Gun Collector
02-20-17, 23:40
Quick update. I have been blazing away with Mildred. Shot a bunch of Monarch Steel. I can feel it getting a bit sluggish from all the gunk, but it soldiers on.
Today I did a sort of variation on the 6/6/6 drill. Starting from it being on safe, sling ed with hands off the gun draw and fire 3 shots in the head of a target at 21 feet (accounting for offset) reload and fire 3 more shots and try to keep it under six seconds. Lots of fun.
I shot it's German big sister a little today.
https://c1.staticflickr.com/1/747/33027367575_2c1586a0bb_k.jpg (https://flic.kr/p/SjvTHZ)Untitled (https://flic.kr/p/SjvTHZ) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
GarandShooter
02-21-17, 00:21
Double post, sorry!
GarandShooter
02-21-17, 00:22
Awesome thread! I've been interested in a thread like this.
johnnywitt
02-23-17, 08:45
I would suggest that you look at the M4 vs M4A1 barrel profiles before you state that the weight is all forward. The M4A1 barrel has much greater thickness rearward of the front sling swivel. I really like that feature since it adds barrel rigidity. I know that the Ordnance Department made the change to better handle sustained automatic fire but there is an added benefit of increased barrel rigidity. All one has to do is watch Larry Vickers high speed video of him firing an M4 to understand how much barrel deflection occurs even during firing.
I go Colt SOCOM, or Pencil: one or the other depending on use. For a defensive weapon to defend your position (maybe with high round counts) I like the SOCOM Barrels. If I'm going to be carrying the gun around in the Rockies for 10-20 miles, I like as light a friggen gun I can get. This trickles down to all gear, pack, footwear, etc.
You really don't give up that much with a Pencil except weight. If you ever get in a bad firefight with a pencil barrel and your groups open up a little, that will probably be the least of your concerns.YMMV.
I go Colt SOCOM, or Pencil: one or the other depending on use. For a defensive weapon to defend your position (maybe with high round counts) I like the SOCOM Barrels. If I'm going to be carrying the gun around in the Rockies for 10-20 miles, I like as light a friggen gun I can get. This trickles down to all gear, pack, footwear, etc.
You really don't give up that much with a Pencil except weight. If you ever get in a bad firefight with a pencil barrel and your groups open up a little, that will probably be the least of your concerns.YMMV.
I may be wrong but the Colt SOCOM barrel looks a lot like the M4A1 barrel. I tend to believe they are the same.
hotrodder636
02-23-17, 10:37
You have shot 3500ish rounds in two weeks out of a single gun?
Quick update. I have been blazing away with Mildred. Shot a bunch of Monarch Steel. I can feel it getting a bit sluggish from all the gunk, but it soldiers on.
Today I did a sort of variation on the 6/6/6 drill. Starting from it being on safe, sling ed with hands off the gun draw and fire 3 shots in the head of a target at 21 feet (accounting for offset) reload and fire 3 more shots and try to keep it under six seconds. Lots of fun.
I shot it's German big sister a little today.
https://c1.staticflickr.com/1/747/33027367575_2c1586a0bb_k.jpg (https://flic.kr/p/SjvTHZ)Untitled (https://flic.kr/p/SjvTHZ) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
I may be wrong but the Colt SOCOM barrel looks a lot like the M4A1 barrel. I tend to believe they are the same.
Fairly similar, but not the same.
http://i30.photobucket.com/albums/c341/faawrenchbndr/IMG_3281.jpg
Fairly similar, but not the same.
http://i30.photobucket.com/albums/c341/faawrenchbndr/IMG_3281.jpg
The top barrel is an M4A1 barrel and the bottom barrel is an M4 barrel. The M4 barrel is not a SOCOM barrel. Check out the photo in this advertisement: http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=SP65054 That's what a Colt SOCOM barrel looks like.
Gentlemen, This shows a number of examples of various M16/AR15/M4 barrel profiles: http://fidelisfirearms.com/category/colt-parts/colt-barrels/
hotrodder636
02-23-17, 13:36
Pretty sure the top one is the same as the on in the link. You can see the flat facets rear of the GB from the top instead of the side like in the shot from G&R.
The top barrel is an M4A1 barrel and the bottom barrel is an M4 barrel. The M4 barrel is not a SOCOM barrel. Check out the photo in this advertisement: http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=SP65054 That's what a Colt SOCOM barrel looks like.
Pretty sure the top one is the same as the on in the link. You can see the flat facets rear of the GB from the top instead of the side like in the shot from G&R.
Yep, as I earlier noted - a Colt SOCOM barrel is pretty much just like an M4A1 barrel in terms of profile. My exact quote was "I may be wrong but the Colt SOCOM barrel looks a lot like the M4A1 barrel. I tend to believe they are the same."
BangBang77
02-23-17, 14:04
Quit shitting in Mr Ball's thread...
hotrodder636
02-23-17, 14:06
Mr. Bell...
Quit shitting in Mr Ball's thread...
Anyways...
I am looking to put a pencil/light weight barrel in my go to upper. It is easier for me to swing onto target and move in transitions.
The Dumb Gun Collector
02-23-17, 16:48
"You have shot 3500ish rounds in two weeks out of a single gun?"
Hell naw! I wish. Just about 200 or so.
hotrodder636
02-23-17, 16:54
Missed the starting round count in the original post. Had to re-read, the. Found it! Happy shooting!
"You have shot 3500ish rounds in two weeks out of a single gun?"
Hell naw! I wish. Just about 200 or so.
Quick update. I have been blazing away with Mildred. Shot a bunch of Monarch Steel. I can feel it getting a bit sluggish from all the gunk, but it soldiers on.
Today I did a sort of variation on the 6/6/6 drill. Starting from it being on safe, sling ed with hands off the gun draw and fire 3 shots in the head of a target at 21 feet (accounting for offset) reload and fire 3 more shots and try to keep it under six seconds. Lots of fun.
I shot it's German big sister a little today.
Are you seeing any vertical stringing as the barrel warms up a bit?
thanks
g
The Dumb Gun Collector
02-26-17, 18:23
Still chugging along nicely. Came up with the smorgasbord drill.
Basically...
3 shoots on plate at 50 yards
3 shots at smallish targets at 100 yards
Transition
6 shot Bill Drill
reload
6 shots, 2 at a tile on three different plates.
Next week I will incorporate lateral movement into the last string.
Much fun...
Pardon my form, I just set up my iPhone and let fly...
https://youtu.be/c-vyBbu1br4
The gun is running great. Decided to look at the guts....
https://c1.staticflickr.com/4/3774/32321383613_61771af54c_k.jpg (https://flic.kr/p/Rf8xhH)Untitled (https://flic.kr/p/Rf8xhH) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
https://c1.staticflickr.com/3/2835/32754263410_ff4e823052_k.jpg (https://flic.kr/p/RUoanu)Untitled (https://flic.kr/p/RUoanu) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
I may have mentioned, I am only running two mags. I keep them loaded at all times (30 rounds). These are getting shot and dropped all the time. I just want to see how they stand up
https://c1.staticflickr.com/3/2848/32321384253_927711aa81_k.jpg (https://flic.kr/p/Rf8xtK)Untitled (https://flic.kr/p/Rf8xtK) by stoiclawyer (https://www.flickr.com/photos/52942291@N00/), on Flickr
As far as vertical stringing no. BUT, when I shoot groups I tend to shoot three separate groups of five at 100 and 200. Basically I think the barrel doesn't get particularly hot. And for shooting with a red dot at 50, 75 and 100 I definitely can't tell anything.
Doc Safari
10-25-18, 10:59
Bumping this one to the top because I just received my AR15A4 (AR6720). I'm 50+ years old and I'm converting to the lightweight club. For now, I plan to keep mine bone stock except I plan to replace the thicker M4 handguards with skinny CAR handguards, and since I'm emphasizing light weight I'm going to keep it iron-sighted for now, although I may replace the MagPul MBUS with a DD 1.5 fixed rear sight, an LMT chopped carry handle style sight, or an outright A2 carry handle.
I plucked this video out of another thread:
https://youtu.be/HslTE5iyUIA
Greg:
Any new updates on yours?
My business partner keeps trying to get me to clean my AR and my glock. I think he wants to slip his in while I’m working on mine.
I’m at over 2k on the AR. IDK how many over, but it looks clean enough still. Just some drops of oil on the moving bits occasionally. Works like the day I got it.
Beat Trash
10-27-18, 11:40
Bumping this one to the top because I just received my AR15A4 (AR6720). I'm 50+ years old and I'm converting to the lightweight club. For now, I plan to keep mine bone stock except I plan to replace the thicker M4 handguards with skinny CAR handguards, and since I'm emphasizing light weight I'm going to keep it iron-sighted for now, although I may replace the MagPul MBUS with a DD 1.5 fixed rear sight, an LMT chopped carry handle style sight, or an outright A2 carry handle.
I really like the 6720. For years, I used a 6520 as my, "Go-To" gun. Same basic gun but the 6520 had the fixed carry handle.
The skinny CAR hand guards feel great on this gun. If you plan on sticking with iron sights, I'd highly recommend the DD 1.5 fixed sight. Effective, small and light weight.
I'm also 50+ years old. But so are my eyes. A good RDO for me is becoming more and more of a necessity as time goes by. With the RDO installed, I keep the MBUS sight as it's light weight, yet still an effective BUIS.
Doc Safari
10-28-18, 11:48
I really like the 6720. For years, I used a 6520 as my, "Go-To" gun. Same basic gun but the 6520 had the fixed carry handle.
.
Would love to have a 6520. I saw one at the last gun show but it was used, abused, and bubbafied.
I got this carry handle for my 6720 upper.
https://www.cncguns.com/misc.html
Much lighter than A2.
Still sorta looking for a 6520 upper though! I think I have a problem ;-)
Dennis.https://uploads.tapatalk-cdn.com/20181028/b0e2bd01085391411294d8a5b38f3a71.jpg
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I got this carry handle for my 6720 upper.
https://www.cncguns.com/misc.html
Much lighter than A2.
Still sorta looking for a 6520 upper though! I think I have a problem ;-)
Dennis.https://uploads.tapatalk-cdn.com/20181028/b0e2bd01085391411294d8a5b38f3a71.jpg
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That is sharp looking, I really like that A1 style carry handle. My go-to carbine has an A2 CH on it but this looks like it would be even lighter.
Doc Safari
10-29-18, 09:09
Are those carry handles even still available? Website says "while inventory lasts."
turnburglar
10-29-18, 21:41
@Doc Safari-
I know you said you wanted to keep it lightweight, so you are sticking with irons and handguards?
The ironic part is that red dot and rail tech has come so far, that a lighter gun could easily be built by getting rid of the FSP and handguards. I didnt realize this till I weighed all the parts, but an FSP alone is 5.5 oz's and is easily replaced by a lo pro gas block and lightweight RDS.
If you want to get really light weight instead of going with a 12-15 inch rail, get a 8-10 inch rail.
I chased the light weight fad for my builds, and ended up with good results for a good price with ALG & BCM rails.
Doc Safari
10-30-18, 08:35
@Doc Safari-
I know you said you wanted to keep it lightweight, so you are sticking with irons and handguards?
The ironic part is that red dot and rail tech has come so far, that a lighter gun could easily be built by getting rid of the FSP and handguards. I didnt realize this till I weighed all the parts, but an FSP alone is 5.5 oz's and is easily replaced by a lo pro gas block and lightweight RDS.
If you want to get really light weight instead of going with a 12-15 inch rail, get a 8-10 inch rail.
I chased the light weight fad for my builds, and ended up with good results for a good price with ALG & BCM rails.
What I ended up doing was to order a PA police trade-in 6520 with fixed carry handle for my iron-sighted carbine.
The 6720 will be my challenge to come up with the lightest upgrades possible: RMR, lightest WML I can find, etc. It may take months of research to accessorize it.
Nice thread. I too find my AR’s to be quite reliable. It’s I’mpressive how well these guns run, which is reason # one million as to why it’s americas sweetheart. I have a Colt pencil barrel with DD RIS II with FSB cut out. Aimpoint....just love it.
Look forward to seeing that round count rock on.
PB
I have a 6920, 6920 OEM2, 6960 and soon a 6933-EPR "pistol" on a Colt lower when Grant receives the uppers. The 6720 is the missing Colt rifle in my safe. This thread makes me want one with Magpul SL furniture.
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I have a 6920, 6920 OEM2, 6960 and soon a 6933-EPR "pistol" on a Colt lower when Grant receives the uppers. The 6720 is the missing Colt rifle in my safe. This thread makes me want one with Magpul SL furniture.
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You want a 6720 with Magpul SL furniture too? I'm in the same boat.
I'm doing the build it yourself version though. I have a Colt 6720 barrel that I got from G&R, and I have the SL handguards and stock both waiting on me to get my act together.
I'm torn though... I keep trying to convince myself to use a Centurion Arms C4 Rail instead. :fie:
You want a 6720 with Magpul SL furniture too? I'm in the same boat.
I'm doing the build it yourself version though. I have a Colt 6720 barrel that I got from G&R, and I have the SL handguards and stock both waiting on me to get my act together.
I'm torn though... I keep trying to convince myself to use a Centurion Arms C4 Rail instead. :fie:I do love the Centurion rails!
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I do love the Centurion rails!
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You're not making this any easier. ;)
I had heard Colt has stopped putting the "F" mark on F-height FSBs, I guess because they are now the default FSB and there is thus no reason to bother marking them?
Are the 6720s (And the AR15A4 20" rifles for that matter) still using Non-F height FSBs/taller front sight posts like they originally were, or are they now leaving the factory with Fs as well?
Curious because I was considering getting a 6720 barrel and putting it on an A2 upper with a fixed carry handle at some point.
TexasAggie2005
11-04-18, 08:31
6720 in Magpul SL furniture? Love mine.
https://i.imgur.com/pGnMEjH.jpg
6720 in Magpul SL furniture? Love mine.
https://i.imgur.com/pGnMEjH.jpgBrownells complete Colt lower and a 6720 upper, eh? Very nice, that's exactly what I want!
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TexasAggie2005
11-04-18, 09:10
Brownells complete Colt lower and a 6720 upper, eh? Very nice, that's exactly what I want!
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Keen eye!
Keen eye!
:D
And that was on my phone, too!
Nice.
I will be using a standard SL stock and an MOE grip though.
TexasAggie2005
11-04-18, 10:16
Nice.
I will be using a standard SL stock and an MOE grip though.
I have the SL on my main carbine. Once you add a QD to the SL-K, it's almost the same weight as the SL with a built in QD. So, in hindsight, the SL would have suited just fine.
6720 in Magpul SL furniture? Love mine.
https://i.imgur.com/pGnMEjH.jpg
Between you are Greg, I broke down and bought one today. Well, two. One for me and one for my wife who told me she would like to get more into shooting with me. I'm going to order Magpul SL furniture and K2 grips for both.
TexasAggie2005
11-11-18, 09:15
Between you are Greg, I broke down and bought one today. Well, two. One for me and one for my wife who told me she would like to get more into shooting with me. I'm going to order Magpul SL furniture and K2 grips for both.
PM your address and I'll send you a mildly used K2 I have laying around. I found out I prefer the SL & SL-K grips over the K2. K2 has a some contours that don't play nice with my hand and grip style.
PM your address and I'll send you a mildly used K2 I have laying around. I found out I prefer the SL & SL-K grips over the K2. K2 has a some contours that don't play nice with my hand and grip style.Thank you brother, that's very kind of you.
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Doc Safari
11-11-18, 09:55
I'm a bad,bad boy. The worst. I'm such a fan of the 6720 now that I'm having my 6721 rebarrelled with a pencil barrel. The atrocity.
indianalex01
11-19-18, 18:41
Between you are Greg, I broke down and bought one today. Well, two. One for me and one for my wife who told me she would like to get more into shooting with me. I'm going to order Magpul SL furniture and K2 grips for both.
I got my wife one. Adding skinny hand guards and a hogue grip for it. I love the 6720
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