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Thread: 11.5" Carbine Barrels
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13 April 2014, 12:38 #1
11.5" Carbine Barrels
I've noticed that some companies have quit making 11.5" carbine barrels while others don't make carbine barrels shorter than 11.5". A local Gunsmith advised that my new upper that I'm building be a 11.5" rather than a 10.5" due to reliability. Do 10.5" barreled uppers have that much of issue with reliability? I have been considering using a 11.5" barrel with an 10.75" URX 3.1.
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13 April 2014, 13:15 #2
Dwell time is an important consideration in having a reliable gas system. An 11.5 with carbine length gas system has a 40% longer dwell time than a 10.5 according to Paul Buffoni at BCM. I have a couple of BCM BFH barrels in 11.5. They have .073 gas ports and Bravo Company recommends an H buffer, but they cycle most lots of PMC Bronze just fine with an H2 buffer and full-auto BCG.
Last edited by Hmac; 13 April 2014 at 14:35.
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13 April 2014, 13:23 #3Contributing Member
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Dwell time? Is that how long the gas is in the gas tube? Sorry for the newbie question. Still learning here.
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13 April 2014, 13:39 #4
Thanks HMAC this is my first venture with a SBR.
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13 April 2014, 14:34 #5
I have no experience with 10.5s, but can attest that my 11.5 inch barrels run very well. I should specify that I don't run a suppressor on any rifle. That makes a difference as it changes the pressure profile.
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13 April 2014, 15:17 #6LEO / MIL
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10.5s are perfectly fine and have been ran in special units for quite a few years.....no problems with my DI 10.5 or. 7.5 piston.....having the right size gas port is essential though.
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13 April 2014, 15:47 #7
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13 April 2014, 15:57 #8
It's between a 10.5" and a 11.5". If I do a 10.5" the barrel will be a Noveske. I haven't decided on a barrel if I were to do a 11.5".
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13 April 2014, 16:03 #9
Keep in mind there is a shit-ton of blast (technical term) from a 10.5" barrel. The manual for my Gemtech 5.56 suppressor says the warranty is borked if used on a barrel less than 12". Just something to consider.
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13 April 2014, 16:09 #10
Is the blast much different between a 10.5" and a 11.5"?
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13 April 2014, 16:36 #11
Ha..Ha...ha.. MD, I experienced this about two weeks ago. Me and a bud went to the range and took several rifles with us. I shot his SBR piston pistol, and not only did I have a hell of a time controlling it, rapid fire, but the muzzle blast was something to behold. Something I was fairly familiar with from my days of handgun hunting, and working up loads at the bench, but this one caught me off guard. Now I know the proper unit of measure for this is "Shit-tons".
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13 April 2014, 16:58 #12
Can't compare, but the blast from my 11.5 is greater than my 16 inch (SBR also has a BattleComp muzzle device). Not overly so...I notice it mostly shooting it indoors. Completely manageable, but noticeable.
In this video, the first rifle being shot is my 11.5 with BattleComp. https://www.youtube.com/watch?v=vtpGrPpxIEA Watch it and draw your own conclusions.
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13 April 2014, 17:05 #13LEO / MIL
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13 April 2014, 17:07 #14Contributing Member
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13 April 2014, 17:09 #15LEO / MIL
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