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CampingJosh · 02-26-2012, 08:34 PM

Nope. The upper could just as well be a pistol upper.

The serialized lower is the part that you list on your ATF form 1.
However, you do list the caliber, barrel length, and overall length, so you may need to contact ATF before replacing the upper with an upper that is a different size or caliber.

02-26-2012, 08:34 PM	#3
CampingJosh TFF Moderator/Host Join Date: Sep 2007 Location: Indiana Contributor Posts: 4,788	Re: Selling an SBR upper Nope. The upper could just as well be a pistol upper. The serialized lower is the part that you list on your ATF form 1. However, you do list the caliber, barrel length, and overall length, so you may need to contact ATF before replacing the upper with an upper that is a different size or caliber. __________________ Nothing posted on TheFirearmsForum.com constitutes legal, accounting, gunsmithing, or other professional advice. Readers are encouraged to consult with qualified professionals for real advice. Your life is lived at your own risk. Don't blame me for the dumb things you do.