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About to do a Form 4 on AAC MPW 9 inch - two questions

razor488

Private
Full Member
Minuteman
Jan 12, 2014
52
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I am about to order a Saker 762 and a AAC MPW in 9 inch. My biggest concern is the high price of 300 BLK ammo but I am going to get it anyway. My two questions are:

1. Other than building an AR, is there another option out there that I should consider? I would rather just do a form 4 on a new gun rather than messing with a form 1 and having it engraved etc...

2. Once I get the stamp and everything, can I throw a short barrel .556 upper on there and be good to go? (Lower is the part that is SBR right?)

Thanks!