Pistol buffer tube on SBR build while waiting for stamp?
So I've been doing a lot of research the past couple days since I finally received my complete 10.5" side charger upper from ASA in preparation for my build. I also have the lower basically complete at this point too...
From what I have been able to research, it looks like it would be perfectly legal for me to put a pistol buffer tube onto my lower and use the gun as a pistol AR while I wait for my stamp.
The lower was purchased as a virgin, stripped lower, so it was not sold as a rifle... according to the research I have done, there is nothing wrong with setting this up as a pistol (I thought that I had heard that a pistol ar had to be registered as such, but upon further investigation, if it's a custom build, there is no requirement so long as you do not violate NFA rules).
Has anyone else done this? It seems like it would be a great way for me to start enjoying my $2,000+ investment right away while I wait the 4-5 months for my stamp to come back.
Glock 19 G4 BFG | Glock 17 G4 FDE | S&W M&P 22 | Ruger GP100 4" | Sig P226 MK25 | HK USP 9 | HK USP 45 (Tan) | HK P2000 9mm | HK P30L 9mm | HK VP9 | Walther PPQ 9
Daniel Defense DDM4 V4 | Arsenal SGL 21 | ASA Side-Charger SBR | Savage Mark II FV-SR
Mossberg 590A1 20" SP | Mossberg 500 Cruiser