I'm building an AR pistol

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Anything else I need to know?

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It's a novelty firearm that I'll probably build one day. I wouldn't do a pistol as a first build. Most people can't hit anything past 20 yards with one.

Which caliber and what length you going with?

11.5

Wanna sell that brace?

No thanks. I keep it so if I build another I can do it as a pistol while my I wait on my stamp.

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No thanks. I keep it so if I build another I can do it as a pistol while my I wait on my stamp.

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You have a lot to learn here. You must sell me that. It's the rules of the OB. And I'm going to low ball you insultingly

Why BCM chose 11.5 over 10.5 this is the only time I ever link arf.com

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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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burgeman

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Also to back up this post, 5.56 isn't nearly as effective out of a shorter barrel. For personal defense it shouldn't matter since you can get multiple shots on target quickly with an AR. But don't expect it to be able to reach out nearly as far as a 16"-20" AR.

But I will say they are super compact and fun as an SBR. As a pistol, there's little use in my mind. The ridiculous ATF regulations prevent us from just slapping a stock on it. Then again, don't put the Sig brace to your shoulder and effectively redesign it!!

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I've got a Phase 5 pistol buffer tube. I'd be willing to part ways with it.

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I wish you would have shown me this 4 days ago. My LPK just came in today.

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Wait, people do this? I've only ever shot it strapped to my arm.

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