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Thread: 11.5" Carbine Barrels
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10 September 2014, 19:45 #61
Yeah I think I am going to go with a 10.5" as well.
Sent from my Windows Phone 8.1Just a regular guy.
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10 September 2014, 20:49 #62LEO / MIL
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Owner/Instructor- Semper Paratus Arms
www.semperparatusarms.com
Master Armorer/R&D- SIONICS Weapon Systems
www.sionicsweaponsystems.com
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11 September 2014, 08:41 #63
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11 September 2014, 11:26 #64Contributing Member
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11 September 2014, 11:33 #65
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11 September 2014, 11:45 #66
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11 September 2014, 11:50 #67
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11 September 2014, 13:16 #68
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11 September 2014, 14:13 #69Contributing Member
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I have a 10.5 MK18 clone. Having said that, the reason I've seen quoted most often on the intertubes is 11.5 has significantly improved reliability. See Paul from BCM's answer below:
Q: Why BCM chose the 11.5" SBR over the 10.5"
I get this question a lot. It is a good one. When we spec our program we can build anything we would like, so we sat down and looked at the pros and cons.
First Statement: I know a good 10.5" SBR can run very well. I personally own a semi MK18 type and it runs great. No problems.
A: Dwell time.
Dwell time is the time that your gas operated weapon maintains pressure to continue the cycling of the weapon. It primarily exsists from the time the bullet passes the gas port in the barrel to the time the bullet exits the muzzle. When you pull the trigger and fire the weapon the movement of the bolt carrier group unlocks the bolt, extracts, and ejects the spent casing. Then it cocks the weapon, feeds, chambers the next round, and then locks again. One of the thing that can make SBRs finicky is the dwell time (or lack of).
The 11.5" carbine is approximately 4% longer weapon than its' 10.5" counterpart, but this extra inch gives the barrel a 40% increase in length for dwell time. IMHO, this is an excellent trade off. This additional dwell time (all other things being equal) will allow the carbine to be more forgiving to different ammo types, extremes in air temperature, weak or worn extractor springs, worn extractors, buffer weights, etc.
Last Statement: For those folks who have a 10.5" that works very well, I would reply; me too. (see first statement)
If I had to "go to war" with a AR15 Carbine, I would grab the BCM 11.5".
The BCM 11.5" Runs Like a Dream.
Hope this info helps,
Paul
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11 September 2014, 14:39 #70
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11 September 2014, 16:32 #71
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11 September 2014, 16:46 #72
11.5" Carbine Barrels
Last edited by Ride4frnt; 11 September 2014 at 17:10.
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12 September 2014, 03:32 #73
I specifically bought an Aero "Pistol" marked lower so there would be no questioning whether it was an SBR by uneducated folks at the range, and that my pistol build was a in fact a pistol. Now that my NFA trust is done, I will be SBR'ing an additional receiver or two. I have a Voodoo Innovations 11.5" medium contour barrel on the bench right now, along with an Adams Arms piston kit. I have a feeling it will be somewhat heavy, but for the price I paid for the barrel and piston kit set up shipped to my door, (compared to a lot of barrels out there I basically got the piston kit darn near free), I figured I'd experiment with the piston system. I need to decide on a MD now. For the next upper, I'm considering a 12.5" barrel DI gas set up for an actual SBR.
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12 September 2014, 13:06 #74LEO / MIL
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I think either would be a good choice. The melonite advantage is that you have a more uniform coating and wear resistance. But, chrome lined barrels are a proven and probably still eclipse the melonite in terms of overall sales. We probably sell 3 chrome lined barrels for every 1 melonite. We are going to focus more on the melonite 16" barrels and a few new offerings that we are working on. There will be some LW dissipator and medium contour dissipator stuff coming soon.
Image a nice dissipator upper with something like a Geissele MKII rail or a 12" MI KeyMod rail.
Owner/Instructor- Semper Paratus Arms
www.semperparatusarms.com
Master Armorer/R&D- SIONICS Weapon Systems
www.sionicsweaponsystems.com
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12 September 2014, 16:12 #75
Welp, 11.5" it is. I just saw a 10.3" with the muzzle device I plan to use and I'm not a huge fan of it aesthetically. If I don't even like how it looks, and then it didn't perform right, I'd be t.o.'d