Building My First AR (7.62x39) Any tips?

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areader

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Hey guys so I completely forgot I had an NEA upper and lower sitting in my safe, and below it i found about 2000 rounds of 7.62x39 ammo. first thing that came to my head was " hey, lets build an ar in 7.62. Is there any tips or anything you guys would suggest when doing such a thing? does a certain gas system work better than another? suggested barrel length and so on?
 
My only suggestions are

mags - the XCR 10-round pistol mags work great, and

BCG - my PSA has run flawlessly.

I have a factory PSA upper on a Bushmaster lower with an H carbine buffer.
 
For the bcg. Either run nea because they have a lifetime warranty which you will require every 3 months or 2000 rounds. Or you shell out 3-400 bucks on a lmt bolt, which i think is now discontinued. Or wait till irunguns brings in the psa again
 
there's a PSA upper in the EE right now for sale...I've got one and can't say anything bad about it...runs like a top.
 
Happily the LMT Superbolt still exists, part # L7R3B.:)
ww.lmtstore.com/parts/bolts-carriers-and-groups-complete/l7r3b.html
Questar can import it for you.
 
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