my buddy does this quite a bit. he buys a pistol upper and a rifle lower, and registers them as SBRs. obviously you need to have all your paperwork back from the atf, and the gun engraved with your name.
Favorite range gun for the money - CZ 75B or STI Spartan V 9mm
Go-to carry setup - Walther PPS or PPQ in FIST kydex holster 1AK
Favorite semi-auto design - HK P7
"A Sig is like a lightsaber - not as clumsy or random as a Glock."