yeah it came with the round crappy one.CPD Mags run good in my X39's. Didn't the upper you bought come with a handguard, the AR rail system are all the same in my experience, maybe i don't understand what you mean by 5.56 rail
ACS magazines are the most reliable for 762x39 ARs. As for hand guards, assuming you're talking about a free float hand guard, any will work unless PSA used a proprietary barrel nut (unlikely with PSA)
For the most part, it uses standard lower parts as well The only parts that are different are the front take down pin and the mag release.They don't. I checked before my first post. Even their hybrid KS47 uses standard upper parts.
For the most part, it uses standard lower parts as well The only parts that are different are the front take down pin and the mag release.
But....... I seem to remember that PSA did have some handguards that did use proprietary barrel nuts a few years back though I dont believe the still do. In either case the OP said his came with a standard AR plastic guard and that would have a regular nut
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