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Col_Crocs
02-14-17, 16:00
Been out of the loop a while and am only now starting to read back up on things. I've been pretty content with my ARs and haven't really felt the need to build anymore. I've started coming back here to read up and started thinking that if I were to consider building another one, it'd probably be a 10.5. It seems to me, though, a properly gassed 10.5 is harder to come by these days, than when I "left". Which begs the question... who makes a properly gassed CL, CHF (or not), 10.5 barrel nowadays? Are we at a point where what would've have been go-to brands like Noveske or DD need tweaking with a BRT kit? Or perhaps even cutting down a Centurion Arms 12.5 or 14.7?

jpmuscle
02-14-17, 16:08
If I were you and your doing a complete rifle I'd vote for starting with a colt mod 2 OEM and having it cut down. Then the port opened up as needed.

If you just need the barrel a 10.5 from from SOLGW will come with 071ish port iirc. BCM won't give out their port sizing, I tried. Monty at centurion will and I THINK you might be able to get custom length cut down from him. I inquired awhile back about a 10.3.

I still vote colt OEM.

fallenromeo
02-14-17, 16:18
to add to that, BCM doesn't make a 10.5 in 5.56. So that would need to be cut down from an 11.5 as well

Iraqgunz
02-14-17, 17:58
I would get a Colt barrel (6920 or SOCOM) and have it Caitlyned by Marvin Pitts.

docsherm
02-14-17, 18:52
LMT and Noveske are your best bet for 10.5" barreles. I have both in 10.5" and have no issues.

556BlackRifle
02-14-17, 21:57
+1 on Noveske's 10.5" Barrel.

Col_Crocs
02-14-17, 23:10
Thanks everyone.
Thanks for pointing out Colt. Made me head to Grant's site and what do you know.... he has 10.3 Colt barrels. A custom direct from Centurion sounds enticing too. I've always been a big fan. As for Noveske, my current go-to sports a Noveske 12.5 and I'm very happy with it but how are they these days? Any difference in quality or QA/QC?

Iraqgunz
02-14-17, 23:25
Except they are overgassed and will choke you out once you add a suppressor.


LMT and Noveske are your best bet for 10.5" barreles. I have both in 10.5" and have no issues.

tango-papa
02-14-17, 23:58
If I were you and your doing a complete rifle I'd vote for starting with a colt mod 2 OEM and having it cut down. Then the port opened up as needed.

If you just need the barrel a 10.5 from from SOLGW will come with 071ish port iirc. BCM won't give out their port sizing, I tried. Monty at centurion will and I THINK you might be able to get custom length cut down from him. I inquired awhile back about a 10.3.

I still vote colt OEM.

FYI - BCM 11.5 BFH upper with standard front sight post purchased mid 2016 has a .076 gas port as measured in the Semper Paratus armorer course.

tp

Ryno12
02-15-17, 01:36
Thanks everyone.
Thanks for pointing out Colt. Made me head to Grant's site and what do you know.... he has 10.3 Colt barrels. A custom direct from Centurion sounds enticing too. I've always been a big fan. As for Noveske, my current go-to sports a Noveske 12.5 and I'm very happy with it but how are they these days? Any difference in quality or QA/QC?

Don't get your hopes up, they're OOS.

But yeah, I love my 10.3" Colt. They're great barrels if you can find one.

BufordTJustice
02-15-17, 10:11
I love my Sionics 11.5" with reduced gas port. Perfect for suppressed work.

Highly accurate, as well.

feraldog
02-15-17, 13:15
if ".071-ish port" is about right for an un-canned 10.3-10.5", what would be the suggested gas port size if always suppressed???

BufordTJustice
02-15-17, 13:22
if ".071-ish port" is about right for an un-canned 10.3-10.5", what would be the suggested gas port size if always suppressed???
You could easily go down to .061" or smaller, depending on the can.

I've seen stuff as low as .054" run perfectly with a can.

feraldog
02-15-17, 14:09
thank you BTJ! (fyi - AAC 762SDN6 can)



.

Col_Crocs
02-15-17, 14:12
^^This is what appeals to me about cutting down... just unsure of where to get it done but JP mentioned the possibility of Centurion accommodating it, or, Marvin Pitt's as IG suggested. I'd be keen to try a .063 port with an enhanced carrier.

C4IGrant
02-15-17, 14:13
Been out of the loop a while and am only now starting to read back up on things. I've been pretty content with my ARs and haven't really felt the need to build anymore. I've started coming back here to read up and started thinking that if I were to consider building another one, it'd probably be a 10.5. It seems to me, though, a properly gassed 10.5 is harder to come by these days, than when I "left". Which begs the question... who makes a properly gassed CL, CHF (or not), 10.5 barrel nowadays? Are we at a point where what would've have been go-to brands like Noveske or DD need tweaking with a BRT kit? Or perhaps even cutting down a Centurion Arms 12.5 or 14.7?


The standard: http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=SP64049


C4

Col_Crocs
02-15-17, 14:17
Are those back in stock? I mentioned it on the previous page but was told they OOS.

C4IGrant
02-15-17, 14:21
Are those back in stock? I mentioned it on the previous page but was told they OOS.

LOL, no. Very rare.


C4

BufordTJustice
02-15-17, 14:36
thank you BTJ! (fyi - AAC 762SDN6 can)



.
Roger.

Saker 762 w/ 556 end cap.

jpmuscle
02-15-17, 14:43
The standard: http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=SP64049


C4
Get more in I'll buy one. Along with a mod1/2 OEM [emoji14]

C4IGrant
02-15-17, 14:47
Get more in I'll buy one. Along with a mod1/2 OEM [emoji14]

They are always on order (same as with the HBAR FBI 11.5's). They just don't make that many of them.

Your best bet is to send us an e-mail with what you want so we can notify you when they come in.


C4

Defaultmp3
02-15-17, 15:08
thank you BTJ! (fyi - AAC 762SDN6 can)MicroMOA suggests 0.049" for a suppressed 10.3" to 12.5" carbine using 5.56×45mm NATO ammo, with 0.070" being recommended for unsuppressed. Given the 762-SDN-6 is a bit of a shorty can, you may wish to bump the port size for a dedicated suppressed rifle to 0.055".

If you want to play with stuff like the Vltor A5 system, LMT e-BCG, etc., you can get some pretty low figures. My 11.5" locks back, unsuppressed, on M193 with a port size of 0.063".

C4IGrant
02-15-17, 15:16
MicroMOA suggests 0.049" for a suppressed 10.3" to 12.5" carbine using 5.56×45mm NATO ammo, with 0.070" being recommended for unsuppressed. Given the 762-SDN-6 is a bit of a shorty can, you may wish to bump the port size for a dedicated suppressed rifle to 0.055".

If you want to play with stuff like the Vltor A5 system, LMT e-BCG, etc., you can get some pretty low figures. My 11.5" locks back, unsuppressed, on M193 with a port size of 0.063".

With a GP of .049, the gun will not run with the can off. So the shooter has to figure out if they want a dedicated suppressed weapon (that will only function with a can on) or one that will function with or without the can on. For me, I opted to have my 10.5 run without the can on, BUT not lock back on the last round. This shoots nearly as soft as a dedicated suppressed weapon, but allows me to still run the gun with can off.


C4

feraldog
02-15-17, 15:27
MicroMOA suggests 0.049" for a suppressed 10.3" to 12.5" carbine using 5.56×45mm NATO ammo, with 0.070" being recommended for unsuppressed. Given the 762-SDN-6 is a bit of a shorty can, you may wish to bump the port size for a dedicated suppressed rifle to 0.055".... If you want to play with stuff like the Vltor A5 system, LMT e-BCG, etc., you can get some pretty low figures. My 11.5" locks back, unsuppressed, on M193 with a port size of 0.063".


With a GP of .049, the gun will not run with the can off. So the shooter has to figure out if they want a dedicated suppressed weapon (that will only function with a can on) or one that will function with or without the can on. For me, I opted to have my 10.5 run without the can on, BUT not lock back on the last round. This shoots nearly as soft as a dedicated suppressed weapon, but allows me to still run the gun with can off.

thank you both! excellent and helpful info. this will really help on my current build...

Col_Crocs
02-15-17, 15:42
LOL, no. Very rare.


C4

It's for the best... it would've fast-forwarded my pondering to full-on build mode.

Just to add since we're talking about cutting down and port sizes. Grant, wasn't yours locking back with a .058 port and an LMT E carrier? Have you gone even smaller than that now?

Singlestack Wonder
02-15-17, 15:51
+1 on Noveske's 10.5" Barrel.

Ditto on the Noveske 10.5"....

C4IGrant
02-15-17, 16:15
It's for the best... it would've fast-forwarded my pondering to full-on build mode.

Just to add since we're talking about cutting down and port sizes. Grant, wasn't yours locking back with a .058 port and an LMT E carrier? Have you gone even smaller than that now?

No on locking back. With he Sprinco blue spring and H3. I probably could get it to with a lighter package.

C4


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tango-papa
02-15-17, 16:24
^^This is what appeals to me about cutting down... just unsure of where to get it done but JP mentioned the possibility of Centurion accommodating it, or, Marvin Pitt's as IG suggested. I'd be keen to try a .063 port with an enhanced carrier.

If you decide on a Colt 6920 variation with intent to have it cut down, the gas port should be .062.
IG recently had all 3 of my 6920's for DD RIS rail install and he measured all 3 guns with barrel dates of 10/12, 12/13 and 01/14 at .062.

See post #32
https://www.m4carbine.net/showthread.php?192019-Colt-LE6920-quality&p=2431709#post2431709

tp

dmd08
02-15-17, 19:26
With a GP of .049, the gun will not run with the can off. So the shooter has to figure out if they want a dedicated suppressed weapon (that will only function with a can on) or one that will function with or without the can on. For me, I opted to have my 10.5 run without the can on, BUT not lock back on the last round. This shoots nearly as soft as a dedicated suppressed weapon, but allows me to still run the gun with can off.


C4

What size gas port did this for you? I have a 10.5" barrel and I want the same envelope of function. I realize that my setup may not mimic yours exactly.

jerrysimons
02-16-17, 04:47
Been out of the loop a while and am only now starting to read back up on things. I've been pretty content with my ARs and haven't really felt the need to build anymore. I've started coming back here to read up and started thinking that if I were to consider building another one, it'd probably be a 10.5. It seems to me, though, a properly gassed 10.5 is harder to come by these days, than when I "left". Which begs the question... who makes a properly gassed CL, CHF (or not), 10.5 barrel nowadays? Are we at a point where what would've have been go-to brands like Noveske or DD need tweaking with a BRT kit? Or perhaps even cutting down a Centurion Arms 12.5 or 14.7?

This is where I have settled if not a Centurion Arms barrel for other SBR lengths, but CA no longer has 11.5" and 12.5" barrels on their site?

Col_Crocs
02-16-17, 05:33
They had 12.5s and 14.7s listed on their site last time I checked. A couple of places have their 12.5s in stock too.

fallenromeo
02-16-17, 13:24
rainier arms has their 12.5 in stock https://www.rainierarms.com/barrels/223-5-56-6-8-300blk/centurionarms

JulyAZ
02-16-17, 21:51
Deleted

BufordTJustice
02-16-17, 22:42
I know somebody already shared the link, but here's the Sionics RGP 11.5".

http://sionicsweaponsystems.com/store2015/5/61-5-chrome-lined-stripped.html

$100 less than the centurion barrel. That's an AGB. Or an optic mount. Or half a handguard. Just sayin.

And, yes, Monty makes fantastic barrels.

gripnM4
02-17-17, 00:33
Im sure its been said, but LMT makes a good 10.5 barrel.

Iraqgunz
02-17-17, 03:33
Unfortunately they succumbed to the enlarged gas port game and newer ones are in the .078 range.


Im sure its been said, but LMT makes a good 10.5 barrel.

vicious_cb
02-17-17, 04:14
Unfortunately they succumbed to the enlarged gas port game and newer ones are in the .078 range.

What about their regular barrels? Are the 14.5" and 16" barrels still mil-spec?

lee84101
02-17-17, 10:18
I sent ADCO a 16" Daniel Defense barrel, had them cut it down to 10.5" and open the gas port to .070. It runs great with a Springco white spring and a Spike's ST-T2, with and without my Surefire can.

ADCO's work and service was excellent. I received my barrel back the same week I sent it to them.

BufordTJustice
02-17-17, 14:00
What about their regular barrels? Are the 14.5" and 16" barrels still mil-spec?
The ones that my agency bought for our patrol rifle program are conservatively gassed. Ports are colt-sized. We use 16" with a drop in RAS equivalent and carbine gas.

jstalford
02-17-17, 14:44
Grant helped me get a colt 10.3 barrel after searching for like three years for one under $500. I have only been able to take it out one time, but I only shot it suppressed and it was the sh*t. More fun than my 11.5 FBI barrel and seemed like less face gas (both are very nominal face gas if any outside, but we were inside). Both of us that shot it that day preferred it and they were set up similarly on the same lower/buffer setup, both c4 rail.

IMHO it's worth an email to grant if he'll help you with the hookup. Now that it's warming up I'll try to get out some more with it.

w3453l
02-17-17, 16:02
The ones that my agency bought for our patrol rifle program are conservatively gassed. Ports are colt-sized. We use 16" with a drop in RAS equivalent and carbine gas.

How long ago were they purchased? I wonder if they make seperate sized gas ports for civilian vs LE sales. I know logistically it wouldn't make sense, but I doubt that they opened up gas ports for military sales. So that leads me to ask, when they make runs for LE, do they stick to the original specs? Or do agencies just get everything from the same lots as civilian customers.

mrcarbine
02-17-17, 16:25
i have seen lot but nothing beats the AR platform like an HK 10.4 416 upper receiver.

BufordTJustice
02-18-17, 11:28
How long ago were they purchased? I wonder if they make seperate sized gas ports for civilian vs LE sales. I know logistically it wouldn't make sense, but I doubt that they opened up gas ports for military sales. So that leads me to ask, when they make runs for LE, do they stick to the original specs? Or do agencies just get everything from the same lots as civilian customers.
We procured ours about two years ago for the first batch of 400+. Several subsequent orders of 200+ carbines and they're all still using the same GP dimension. IIRC we're at over 1000 carbines now.

BufordTJustice
02-18-17, 11:33
i have seen lot but nothing beats the AR platform like an HK 10.4 416 upper receiver.
The last HK416 10 point something I shot felt like a 6.8 SPC or 7.62x39 compared to my Sionics 11.5" RGP barrel. It was gross. It was dripping with quality (and weight), mind you. But it wasn't even in the same ballpark.

And that setup had the HK heavy buffer (with red dot on the face) and HK action spring. Same ammo; federal brown box XM193.

So, being noticeably heavier AND having more recoil is a no go for me.

polydeuces
02-18-17, 11:51
With a GP of .049, the gun will not run with the can off. So the shooter has to figure out if they want a dedicated suppressed weapon (that will only function with a can on) or one that will function with or without the can on. For me, I opted to have my 10.5 run without the can on, BUT not lock back on the last round. This shoots nearly as soft as a dedicated suppressed weapon, but allows me to still run the gun with can off.


C4

Grant -
I'm a bit slow sometimes - can you explain the concept of the bolt not locking back etc? Have a hard time getting it.

Going to set up a Centurion 13.5 upper (cut from a 16" mid ) 50/50 suppressed, waiting for adjustable gas block.

Its currently running H2 and Sprinco blue lower.

Thanks.

jstalford
02-18-17, 11:54
Grant -
I'm a bit slow sometimes - can you explain the concept of the bolt not locking back etc? Have a hard time getting it.

Going to set up a Centurion 13.5 upper (cut from a 16" mid ) 50/50 suppressed, waiting for adjustable gas block.

Its currently running H2 and Sprinco blue lower.

Thanks.

Having the gas port small enough to cycle but not lock back allows it to still run unsuppressed but not be too over gassed suppressed.

If it locks back unsuppressed the port could stand to be smaller for mostly suppressed use.


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polydeuces
02-18-17, 12:00
Get it. That was dumb. Somehow my brain froze int thinking "hey it needs MORE power to lock back" - did not make to step to NOT locking back (less power...Dûh...). Need more sleep. Clearly.
Thanks!

C4IGrant
02-18-17, 16:38
Grant -
I'm a bit slow sometimes - can you explain the concept of the bolt not locking back etc? Have a hard time getting it.

Going to set up a Centurion 13.5 upper (cut from a 16" mid ) 50/50 suppressed, waiting for adjustable gas block.

Its currently running H2 and Sprinco blue lower.

Thanks.

No worries. IMHO, of the bolt locks back on the last round (with no suppressor), then it is over gassed. So when you adjust your GB, do so with no suppressor. The gun should be 100% reliable, but just won't lock to the rear.

C4


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w3453l
02-20-17, 15:13
We procured ours about two years ago for the first batch of 400+. Several subsequent orders of 200+ carbines and they're all still using the same GP dimension. IIRC we're at over 1000 carbines now.

Thank you for the info

markm
02-20-17, 16:07
My suppressed shorty wont even strip another round off the mag most of the time if the can is off. It runs a smooth as a rifle with the can on though.

JG007
02-21-17, 22:39
My suppressed shorty wont even strip another round off the mag most of the time if the can is off. It runs a smooth as a rifle with the can on though.

Specs and port size?

JG007
02-21-17, 22:45
I had a FN chf, rainier Mountain barrel, cut down to 10.8" and the gas port was untouched at 069

A5 buffer works well but wouldn't lock back with Ecarrier, which from my understanding is predictable so I'm surprised others use it on small port sbr's with success. Isn't that the specific setup it would be worst for?

dmd08
02-22-17, 00:22
My suppressed shorty wont even strip another round off the mag most of the time if the can is off. It runs a smooth as a rifle with the can on though.

I have 10.5" sbr I shoot mostly suppressed with a Specwar 556K. I put a CustomTune .067 port in the fsb. I'm using a carbine spring and standard full auto carrier. I tried it out at the range today. It ran fine on an H3 buffer with a little gas to the face still. Unsuppressed it wouldn't strip a new round even after going down to a carbine buffer. I was hoping to find a gas port that I could tune for suppressed/unsuppressed use by changing buffer weights but I struck out.

jpmuscle
02-22-17, 00:43
I have 10.5" sbr I shoot mostly suppressed with a Specwar 556K. I put a CustomTune .067 port in the fsb. I'm using a carbine spring and standard full auto carrier. I tried it out at the range today. It ran fine on an H3 buffer with a little gas to the face still. Unsuppressed it wouldn't strip a new round even after going down to a carbine buffer. I was hoping to find a gas port that I could tune for suppressed/unsuppressed use by changing buffer weights but I struck out.
Maybe swap in an A5?

dmd08
02-22-17, 00:44
That's what I'm thinking about trying.

Col_Crocs
02-22-17, 04:51
I had a FN chf, rainier Mountain barrel, cut down to 10.8" and the gas port was untouched at 069

A5 buffer works well but wouldn't lock back with Ecarrier, which from my understanding is predictable so I'm surprised others use it on small port sbr's with success. Isn't that the specific setup it would be worst for?

Port was 069 on their 14.5 CAR?

Eurodriver
02-22-17, 07:20
I had a FN chf, rainier Mountain barrel, cut down to 10.8" and the gas port was untouched at 069

A5 buffer works well but wouldn't lock back with Ecarrier, which from my understanding is predictable so I'm surprised others use it on small port sbr's with success. Isn't that the specific setup it would be worst for?

https://www.m4carbine.net/archive/index.php/t-89708.html

I tried that like seven years ago. Was definitely smoother than a traditional rifle but it wouldn't cycle unsupp no matter what I tried.

If I were snagging a 10.5" today it would be SOLGW. They don't get ridiculous with their port sizes like some other folks have.

Slippers
02-22-17, 08:33
I have 10.5" sbr I shoot mostly suppressed with a Specwar 556K. I put a CustomTune .067 port in the fsb. I'm using a carbine spring and standard full auto carrier. I tried it out at the range today. It ran fine on an H3 buffer with a little gas to the face still. Unsuppressed it wouldn't strip a new round even after going down to a carbine buffer. I was hoping to find a gas port that I could tune for suppressed/unsuppressed use by changing buffer weights but I struck out.

The reality of this arrangement is the Specwar 556k generates significant backpressure, despite the small volume. It makes it difficult to find the right spot for suppressed/unsuppressed use with only a buffer swap, unless you don't mind gas in your face. If you use a 30 caliber suppressor it's much easier to get what you want.

dmd08
02-22-17, 08:46
The reality of this arrangement is the Specwar 556k generates significant backpressure, despite the small volume. It makes it difficult to find the right spot for suppressed/unsuppressed use with only a buffer swap, unless you don't mind gas in your face. If you use a 30 caliber suppressor it's much easier to get what you want.
I have an Omega. I should experiment and see if it works any better.

I shoot it almost entirely suppressed. I was hoping for flexibility. I may go down in port size and just have it be dedicated suppressed.

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JG007
02-22-17, 10:11
Port was 069 on their 14.5 CAR?

Yep, I went with rainier because I like them and they were the only company I could find selling the FN chf barrel that would tell me the port size. They actually answered the phone and put me on hold to go check. They said 068 but it might be closer to 069

For the guy above debating the A5, mine was tested with a standard carbine buffer and functioned with pmc bronze when built. Then I switched it over to a A5H1 lower. I'm surprised you have issues with the carbine buffer.

Regular spring and bcg? My 11.5 bcm loves the green spring and Ecarrier but the smaller port 10.8 did not

BufordTJustice
02-22-17, 12:32
The reality of this arrangement is the Specwar 556k generates significant backpressure, despite the small volume. It makes it difficult to find the right spot for suppressed/unsuppressed use with only a buffer swap, unless you don't mind gas in your face. If you use a 30 caliber suppressor it's much easier to get what you want.
I've got a specwar 556 full size getting ready to make an NFA jail break any day now.

I'll be transitioning from a Saker 762 with 556 end cap. I know I'll be getting more gas, but how much more? Enough to need to adjust the gas block?

11.5 Sionics RGP, LMT e-carrier, A5H4, Tubbs AR10 flat wire, SLR sentry 6 AGB.

Slippers
02-22-17, 15:58
I have an Omega. I should experiment and see if it works any better.

I shoot it almost entirely suppressed. I was hoping for flexibility. I may go down in port size and just have it be dedicated suppressed.

Sent from my SM-G935V using Tapatalk


I've got a specwar 556 full size getting ready to make an NFA jail break any day now.

I'll be transitioning from a Saker 762 with 556 end cap. I know I'll be getting more gas, but how much more? Enough to need to adjust the gas block?

11.5 Sionics RGP, LMT e-carrier, A5H4, Tubbs AR10 flat wire, SLR sentry 6 AGB.

I use the 762 end cap on my Saker. I don't know how much of an effect the 556 end cap has on the back pressure. I can drop at least one buffer weight (H3 to H2, etc) or close my SLR gas block by 1-2 clicks (depending on the barrel length) when I swap from 556K to Saker 762.

I literally gave up on trying to use the 556K on my 10.5" LMT MRP. Even with a Gemtech carrier and A5H4 it ejects forward and recoils like a 12 gauge shotgun. If I throw my Saker 762 on that upper, it is super soft shooting with an A5H2, and won't lock back on empty with an A5H3 once it gets dirty.

On my longer barrels it isn't as noticeable, and the shorter length and weight is certainly appreciated.

In the end I wish I had purchased an Omega, since it weighs just a hair more than the 556K. The Omega is longer, but at least you can change the mount out to the Dead Air Key-mo.

markm
02-22-17, 19:16
Specs and port size?

It's an 11.5" with a .0630" port. I've been porting down a bunch of our SBR barrels lately. Pappabear has an exceptionally thumpy 10.5 that got us going insertable port crazy. My 10.5 ported down to .0715" runs beautifully with .223 pressure ammo and no can.

Iraqgunz
02-22-17, 23:07
I've probably said it a hundred times or so, but with the lack of quality 10.5"/10.3" barrels on the market, the stupid price on the ones you can find and the fact that a good 11.5" will keep running, it makes very little sense to even bother with them.

MistWolf
02-22-17, 23:22
I've got a 10.5" barrel with a .082" gas port. An SLR adjustable gas port allows the AR to run smoothly suppressed or unsuppressed using an H buffer. I plan to also test the setup with an H2 buffer.

Unsuppressed, it can be tuned to eject every time but not lock back on the last round. Opening the gas block one click let's the rifle lock back on the last shot.

Suppressed, I could not get the rifle to eject, but not lock back. I could tune it to lock back, but closing it one more click and the AR would not eject

Zirk208
02-25-17, 13:10
Forgive my ignorance, but would a Colt SOCOM barrel be a good starting point, then having it cut down to the desired 10.3"/10.5" length, and the gas port opened accordingly?

C4IGrant
02-25-17, 13:12
Forgive my ignorance, but would a Colt SOCOM barrel be a good starting point, then having it cut down to the desired 10.3"/10.5" length, and the gas port opened accordingly?

That would work, but if you are shooting it with a suppressor than the .063 GP would be too big.

C4


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MQ105
02-25-17, 14:43
That would work, but if you are shooting it with a suppressor than the .063 GP would be too big.

C4


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I know you (Grant) have a lot of experience in this area, but I'd like to offer some info to counter that statement as being always correct. Depending on the ammo, muzzle device, and possibly silencer .0630 might be good for a 10.3/5" barrel, particularly if it needs to be reliable both suppressed and non-suppressed. It would be nice to be able to start smaller, but I'm not aware of any barrels with a carbine-length system that have a gas port smaller than .063+/- . For suppressed only, them I would want to start smaller, or be prepared to restrict the gas by some means. That has been my experience. For 11.5", .0630 is generally the largest I have had to go to get reliable function both with and without a can.

C4IGrant
02-25-17, 14:51
I know you (Grant) have a lot of experience in this area, but I'd like to offer some info to counter that statement as being always correct. Depending on the ammo, muzzle device, and possibly silencer .0630 might be good for a 10.3/5" barrel, particularly if it needs to be reliable both suppressed and non-suppressed. It would be nice to be able to start smaller, but I'm not aware of any barrels with a carbine-length system that have a gas port smaller than .063+/- . For suppressed only, them I would want to start smaller, or be prepared to restrict the gas by some means. That has been my experience. For 11.5", .0630 is generally the largest I have had to go to get reliable function both with and without a can.

Depends on how you want to shoot it. Since SBR's are so loud and obnoxious that there should be a rule that they are ALWAYS shot suppressed.


C4


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BufordTJustice
02-25-17, 21:46
Depends on how you want to shoot it. Since SBR's are so loud and obnoxious that there should be a rule that they are ALWAYS shot suppressed.


C4


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That's my rule...I only ever remove the can to function test. And that's like 5 shots outdoors.

MQ105
02-25-17, 22:04
Ideally, I agree. However, for some there exists a requirement that the weapon functions without a suppressor - for those Murphy moments. In such a case, slightly increased felt recoil is a tolerated consequence.

Eurodriver
02-26-17, 02:31
That's my rule...I only ever remove the can to function test. And that's like 5 shots outdoors.

Amen.

So much discussion of POI shift with suppressors and I'm just over here like "You take it off?"

BufordTJustice
02-26-17, 14:40
Amen.

So much discussion of POI shift with suppressors and I'm just over here like "You take it off?"
Yeah. To me, and for my uses on duty and off, an SBR is useless without a can.

But that's just me.