Well I can't find a straight answer on this: If I have a single registered and legal SBR lower, can I own multiple SBR uppers (for said lower) while simultaneously having regular un used rifle lowers in the same house? Or does that fall under destructive (?) intent? I would hate to have to leave the other short lowers for my SBR at a different location to avoid getting boned by the long d**k of the law.