Guys i want to create a Sbr 300 blkout to run with my suppressors... im fairly familiar with what needs to happen, but the question i have is if i build the SBR before the tax stamp is received, would it be legal if i just put a pistol stock on it at that point?.... I know i have to wait to actually build the sbr once tax stamp is in my hand but im not sure if one can just make it a "pistol" in the meantime.....