View Full Version : COLT AR-15A4 Lightweight LE Carbine
Fuzzy-Reticle
04-22-15, 18:56
The LGS had a deal on the COLT AR-15A4 Lightweight LE Carbine (6720) so I went home and researched everything I could find on it overnight. After reading all of the threads here about it I decided to buy one. Once I got it home I ditched the OEM furniture and added some MOE stuff I had laying around.
It does not have an "F" marked FSB but I really don't care. I don't have the motivation to remove the site post and put it in a set of calipers but it does appear to look a smidge taller than a normal post. It has to be my imagination or some sort of optical illusion as I don't think I could register such a small difference. Either way it's a COLT and should run just fine.
For those that care it only came with a manual, lock, standard A2 grip/M4 handguards and MBUS. No mag since I live in Colorado and nobody trusts us with anything over 15 rounds. :mad:
The trigger is standard milspec but feels fine without the normal crunchiness of a new milspec trigger.
It has great balance and now I am kicking myself for not buying a LW AR before today. Looking forward to shooting the hell out of it very soon.
Need a DD fixed rear site or maybe an RDS like an Aimpoint Mirco or Trijicon RMR but want to keep this simple and light.
http://i288.photobucket.com/albums/ll190/fuzzyreticle/COLT%20LE%20Lightweight%20Carbine/20150422_172949_zpsph3jsmgx.jpg (http://s288.photobucket.com/user/fuzzyreticle/media/COLT%20LE%20Lightweight%20Carbine/20150422_172949_zpsph3jsmgx.jpg.html)
DD rear site added.
http://i288.photobucket.com/albums/ll190/fuzzyreticle/COLT%20LE%20Lightweight%20Carbine/20150423_083451_zpsblgjee0h.jpg (http://s288.photobucket.com/user/fuzzyreticle/media/COLT%20LE%20Lightweight%20Carbine/20150423_083451_zpsblgjee0h.jpg.html)
What did you pay for it? PSA has these on sale for $799 with free shipping from time to time.
LW ARs are awesome, as long as you're not on an FOB in the sandbox.
Fuzzy-Reticle
04-22-15, 19:39
I got mine for a little less than $800 OTD.
Beat Trash
04-22-15, 19:58
I use one of these as my "Vacation/travel" gun. Wait for the sales on Memorial day and pick up an Aimpoint PRO. These are great carbines.
HardToHandle
04-22-15, 22:20
The 6720 is a carbine - short, fast, there when you need it. Spectacular balance, minimalist presentation.
It feels closest to what Eugene Stoner had in mind 60 years ago.
Moose-Knuckle
04-23-15, 03:32
Nice score! I have two, they are great KISS carbines.
I don't have the motivation to remove the site post and put it in a set of calipers but it does appear to look a smidge taller than a normal post. It has to be my imagination or some sort of optical illusion as I don't think I could register such a small difference.
Colt Front Sight Post Primer
Colt offers four different front sight posts for use on their AR-15/M16 family of weapons. The front sight posts can be categorized according to their basic shape, (square or round) their profile, (straight or tapered) and their height, (short or tall.) The height of the posts are measured from the top of the sight post down to the top of the “flange” of the sight post.
The sight post with the part number SP64507 has a short, square and straight configuration. This post has a nominal height of 0.270”
SP64507
http://www.box.net/shared/static/sfemup3tje.jpg
Part number SP64665 also has a short and square post, but differs from the above sight post in that it has a tapered shape to it; broader at the base and narrowing at the top. The height of this post is also 0.270”.
SP64665
http://www.box.net/shared/static/3ixso44u8q.jpg
Shown below are the square, short/straight and short/tapered sight posts side by side for comparison.
http://www.box.net/shared/static/ym1n1ar5e5.jpg
The sight post associated with the M16/M16A1 series of rifles has a round shape and is also short and tapered. The part number for this post is SP61706. It is slightly shorter than the two posts described above with a height of 0.260”.
SP61706
http://www.box.net/shared/static/9fzjm5e8tq.jpg
The last sight post is Colt’s tall sight post which has a nominal height of 0.300”. It has a square and straight configuration. Its part number is SP62447.
SP62447
http://www.box.net/shared/static/sqgsbhvqc6.jpg
Here is a pic with the round sight post and the tall sight post side by side for comparison.
http://www.box.net/shared/static/fplxodhst6.jpg
The original round sight post has five equally spaced notches around the sight post flange for elevation adjustment. Each notch corresponds to 1 MOA of elevation (when used with a rifle length sight radius). The other three sight posts all have four elevation notches on their flanges corresponding to 1.25 MOA of evlevation.
http://www.box.net/shared/static/d2t6yoj8as.jpg
Bushmaster makes a front sight post that has a nominal height of 0.310”.
http://www.box.net/shared/static/tsdaq4fnkw.jpg
"F" Marked Front Sight Base
There is no difference in the overall height of an “F” marked front sight base and a standard front sight base. The only difference between the two front sight bases is the height of the sight “shelf” above the top of the barrel.
http://www.box.net/shared/static/uei1uar8kw.jpg
http://www.box.net/shared/static/2d520zm04w.jpg
The front sight post on a standard Colt front sight base will bottom-out in the sight well at approximately 24 clicks below flush. On an “F” marked front sight base the sight “shelf” is a whopping 0.040” higher than on a standard front sight base. That means you might have to turn your front sight post down approximately 6 clicks further with an “F” marked front sight base than on a standard front sight base. (6 whole clicks difference. Oh, the inhumanity!) So unless your front sight post is set at 18 clicks below flush with a standard front sight base, using an “F” marked front sight base on a 20" barrel will be a non-issue.
.....
Fuzzy-Reticle
04-23-15, 20:21
Colt Front Sight Post Primer
The last sight post is Colt’s tall sight post which has a nominal height of 0.300”. It has a square and straight configuration. Its part number is SP62447.
SP62447
http://www.box.net/shared/static/sqgsbhvqc6.jpg
.....
That looks like the one in my rifle. I knew it looked different than all of the countless M4 front site posts I have seen.
Thanks for the excellent and informative information.
Beat Trash
04-24-15, 09:07
I have seen a huge amount of band width spent discussing and worrying about the different front sight post of the 6720 s. the 6920. Bottom line is that the front sight post shipped in your 6720 works well for your gun.
If you want to run just iron sights, then the MBUS rear will work. Although I might consider obtaining a Daniel Defense fixed rear.
I'm past the 50 year old mark and my eyes are age appropriate. So for me, a KISS carbine includes some type of Aimpoint red dot optic. An Aimpoint PRO sits on top of my 6720. It's still an extremely light and well balanced gun. I use Aimpoint T-1 micro's on my guns at work, but it was hard to pass up the PRO, considering what they sell for during on-line sales over holidays such as Memorial Day.
Fuzzy-Reticle
04-24-15, 09:35
I have seen a huge amount of band width spent discussing and worrying about the different front sight post of the 6720 s. the 6920. Bottom line is that the front sight post shipped in your 6720 works well for your gun.
If you want to run just iron sights, then the MBUS rear will work. Although I might consider obtaining a Daniel Defense fixed rear.
I'm past the 50 year old mark and my eyes are age appropriate. So for me, a KISS carbine includes some type of Aimpoint red dot optic. An Aimpoint PRO sits on top of my 6720. It's still an extremely light and well balanced gun. I use Aimpoint T-1 micro's on my guns at work, but it was hard to pass up the PRO, considering what they sell for during on-line sales over holidays such as Memorial Day.
I agree. The entire FSP debate is a non issue for me personally. If others want to debate this post or that base it is ok by me.
I am entirely condfident that the rifle I just got will shoot just fine and run just fine and be accurate enough for my purposes.
It handles and points very well with the DD rear site I mounted (stole from another rifle I had).
I will be 44 this July and an RDS is something that my middle age eyes prefer over irons but I will still site them in and in practice with irons to the best of my ability. Being able to effecively use both an RDS and iron sites is something I personally feel all AR owners should know how to do.
What about using an A2 (colt 6520) upper with a F marked sight base. I was thinking I would take .040 of the front sight post
556BlackRifle
04-24-15, 09:55
The LGS had a deal on the COLT AR-15A4 Lightweight LE Carbine (6720) so I went home and researched everything I could find on it overnight. After reading all of the threads here about it I decided to buy one. Once I got it home I ditched the OEM furniture and added some MOE stuff I had laying around.
It does not have an "F" marked FSB but I really don't care. I don't have the motivation to remove the site post and put it in a set of calipers but it does appear to look a smidge taller than a normal post. It has to be my imagination or some sort of optical illusion as I don't think I could register such a small difference. Either way it's a COLT and should run just fine.
For those that care it only came with a manual, lock, standard A2 grip/M4 handguards and MBUS. No mag since I live in Colorado and nobody trusts us with anything over 15 rounds. :mad:
The trigger is standard milspec but feels fine without the normal crunchiness of a new milspec trigger.
It has great balance and now I am kicking myself for not buying a LW AR before today. Looking forward to shooting the hell out of it very soon.
Need a DD fixed rear site or maybe an RDS like an Aimpoint Mirco or Trijicon RMR but want to keep this simple and light.
DD rear site added.
You have good taste. Simple, clean, light and effective. My second to last build is almost identical. I just pulled my MOE off and installed a KAC RAS - I'll probably keep it on there. I'm planning to pick up a B5 SOPMOD-E and then call it good. If my DD rear sight holds true (no reason to think it won't) it will stay right where it is on this "optics free build".
http://img.photobucket.com/albums/v313/Mike16610/RA-Carbine_1_zpsljyylcay.jpg
What did you pay for it? PSA has these on sale for $799 with free shipping from time to time.
LW ARs are awesome, as long as you're not on an FOB in the sandbox.
We also sell 6720's for $799. ;)
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=6720
C4
We also sell 6720's for $799. ;)
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=6720
C4
Great deal, Grant!
We also sell 6720's for $799. ;)
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=6720
C4
Great deal, Grant!
Damn, that is a good deal. I prefer lightweight profile barrels to government profile ones.
Fuzzy-Reticle
04-24-15, 15:58
We also sell 6720's for $799. ;)
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=6720
C4
That is a good deal!
I wish Colt would make this same setup in a midlength. I am not complaining just wishing.
I can't shoot it this weekend as my father is in the hospital recovering from some major surgery and I prefer to be with him. In fact I am in his room as I write this while he sleeps.
In a few weeks I plan on breaking it in.
I picked one of these up about a year ago. Put a TA-33 red horseshoe ACOG on top and a Geissele trigger inside. I like it a LOT.
At $799 I ought to pick up another--just because!
Love my 6720. Aimpoint T1, Geissle trigger, BCM Keymod rail, Surefire X300Ultra, & B5 Systems Bravo stock. Makes for a very lightweight system.
http://i1231.photobucket.com/albums/ee515/cathellsk/b9cb892f694133997e295f844a3bffe1.jpg
Fuzzy-Reticle
04-25-15, 09:02
Love my 6720. Aimpoint T1, Geissle trigger, BCM Keymod rail, Surefire X300Ultra, & B5 Systems Bravo stock. Makes for a very lightweight system.
http://i1231.photobucket.com/albums/ee515/cathellsk/b9cb892f694133997e295f844a3bffe1.jpg
That is exactly what I want to do with mine.
What size low profile gas block is used for the 6720 small barrel profile?
.625 for the 6720. Just installed one from BCM on mine. Works like a champ
.625 for the 6720. Just installed one from BCM on mine. Works like a champ
^^This^^
I also used the BCM low profile gas block.
I also have a DD fixed front sight and MI rail covers with the handstop.
^^This^^
I also used the BCM low profile gas block.
I also have a DD fixed front sight and MI rail covers with the handstop.
Did you dimple the barrel? I didn't and Im now second guessing myself.
Did you dimple the barrel? I didn't and Im now second guessing myself.
Guy at my local shop did the rail/gas block install, so I couldn't tell you, sorry.
We also sell 6720's for $799. ;)
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=6720
C4
This is the place to buy from.
Fuzzy-Reticle
05-06-15, 16:53
So I have a major problem that does not allow me to leave well enough alone.
I found a VLTOR CASV-EL for a steal and I really like how they look and function so I bought it and mounted it on my Colt Lightweight Carbine 6720.
I like the CASV because I don't have to molest the rifle for installation plus it free floats the barrel and offers decent light mounting options with an intergrel sling mounting point.
Yes, it adds a little weight to a very lightweight rifle but in a good way I think. Colt should make the 6720 in an OEM model for numb-skulls like me. ;)
crap cell phone pic
http://i288.photobucket.com/albums/ll190/fuzzyreticle/COLT%20LE%20Lightweight%20Carbine/20150506_151858_zpsvtbwx99k.jpg (http://s288.photobucket.com/user/fuzzyreticle/media/COLT%20LE%20Lightweight%20Carbine/20150506_151858_zpsvtbwx99k.jpg.html)
I love my 6720!
http://i131.photobucket.com/albums/p313/madcatjoe/IMAG0841_zpsj9zwqi8x.jpg (http://s131.photobucket.com/user/madcatjoe/media/IMAG0841_zpsj9zwqi8x.jpg.html)
http://i131.photobucket.com/albums/p313/madcatjoe/IMAG0842_zpsl2adxvuy.jpg (http://s131.photobucket.com/user/madcatjoe/media/IMAG0842_zpsl2adxvuy.jpg.html)
I love my 6720!
http://i131.photobucket.com/albums/p313/madcatjoe/IMAG0841_zpsj9zwqi8x.jpg (http://s131.photobucket.com/user/madcatjoe/media/IMAG0841_zpsj9zwqi8x.jpg.html)
http://i131.photobucket.com/albums/p313/madcatjoe/IMAG0842_zpsl2adxvuy.jpg (http://s131.photobucket.com/user/madcatjoe/media/IMAG0842_zpsl2adxvuy.jpg.html)
What are the specs of that rifle? Rail, optic, etc.
What are the specs of that rifle? Rail, optic, etc.
Daniel Defense LITE III 15" rail
Magpul UBR stock
BCM MOD2 pistol grip
Trijicon TA31F ACOG
Surefire Scout Ultra on LaRue offset mount and with SR05 switch
Magpul XTM enhanced rail covers
brickboy240
05-08-15, 15:31
That is a really nice set up!
Everything you need...nothing you do not.
LOL
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