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SBR designated lower?

Exo

Sergeant
Full Member
Minuteman
Jan 20, 2011
347
1
El Mirage, Arizona
Ok I have looked, and searched, and tried to find this info before posting, but here it goes.

For SBR ownership, does it have to have a designated lower?
I know you need the tax stamp, and the BATFE blessing, and have the lower engraved, etc etc etc

the question is, after all that is accomplished, can I put a standard AR upper back on a SBR engraved lower and be legal?

I dont really see why not, but I just wanted to make sure I wasnt missing some sort of legislation regarding this.