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Old 03-16-2014, 11:21 PM   #1
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Default Next AR Build: Pistol?

While set up at a gun show this weekend, I had my first urge to build an AR pistol. I've always seen them as kind of goofy and didn't really know if they had a point. I imagined them to be awkward to fire and not being very accurate.

All that changed when I caught my first glimpse of the Sig arm brace. I know these have been out for a while, but I guess I didn't see the "secondary" purpose of the brace. Me being naive that I am, I only considered the original purpose and thought that it was even more goofy and pointless. But after seeing one in purpose, the "secondary" purpose hit me like a ton of bricks. Now I think I just HAVE to have one. It's an SBR without the negatives of an SBR. No dedicated lower that has be engraved and has limited resale options, no special fee to pay to the ATF, and no 13 month wait for approval.

I'm really, seriously consider this for my next build. Slap a Sig brace on and it can be sold as a pistol without any problems of trying to resell a SBR. I'm still leaning towards a 5.45x39 for my next build. Is there any problems associated with doing a 5.45x39 in a pistol? I'm think 8.5" to 10" barrel. Looking to heari thoughts on this idea.

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Old 03-17-2014, 01:46 AM   #2
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Default Next AR Build: Pistol?

I would do a 5.56 if your building a pistol. Kind of concerned that 5.45x39 might run scarce soon. I would definitely lean towards a 10" barrel and the carbine length gas system. This way you can avoid the pistol length gas system and the cycling issues it comes with. I got the 7.5" barrel. I had to play with mine quite a bit to get it to purr right. Not enough dwell time in the barrel for the gas. Had to play with muzzle devices and buffer weights to get it right. imageuploadedbyfirearms-talk1395020721.885042.jpgimageuploadedbyfirearms-talk1395020737.125856.jpgimageuploadedbyfirearms-talk1395020752.003872.jpgThe SigTac is bad ass, I just put one on, and love it. It's impossible to use as intended but who cares.


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Old 03-17-2014, 02:11 AM   #3
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Might I suggest you build it as a 300 BLK? I built mine with an 8" barrel and a Noveske KX3. It chews through my 110 grain supersonic loads and 208 grain subs perfectly.


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Old 03-17-2014, 02:43 AM   #4
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I built mine in 5.56, 7.5" barrel, no sig arm brace (yet, it's on the list). Not one issue cycling, all types of 45-62gr brass/steel everything. It can be done relatively inexpensive as well. I'd post a pic of it but imgur is down right now. Maybe later it will work.

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Old 03-17-2014, 11:40 AM   #5
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Thanks fellas. Those two guns are exactly what I'm envisioning. I was thinking 5.45x39 for cost and a pistol size would be easier to clean for the surplus ammo. I already have a 16" 5.56. I'm starting to stock up on the 5.45x39 surplus stuff. I just thought it would make a good SHTF weapon. Light, short, compact, and lots of firepower.

Worst case scenario is the 5.45x39 ammo dries up and several years later I shoot up all of the stuff I've bought, I buy a 5.56 barrel and bolt, do the swap, and I'm back up and running again.


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