SIG P556 Pistol 10" to SBR - Proper NFA Forms? (New Hampshire)

MaverickNH

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I have a SIG P556 Pistol with 10 inch barrel. Built on the AK design, the upper is the sterilized part, not the lower. I’d like to mate that with a SIG 556 folding stock lower to make a SBR. The two parts have never met and live in different places, but others have mated them with no problems, so I figure it’ll work.

Which Form(s) do I need to file with ATF? I’m a NH resident, so no state issues.

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