Still doesn't matter, right? I have numerous stripped "pistol" marked lowers...]
If the OP finds out this lower in question was sold as a complete rifle, then it does matter as to legality. You'd have a clear answer. The lower may never be assembled as a pistol without getting into NFA registration and taxation (and even then it wouldn't be called a pistol --legally it would be SBR).
If it were sold as a stripped rifle lower, but not assembled with other parts to make a rifle, then well technically it could've been assembled into something else initially , BUT I would assume --and BATF may also assume-- that it had been built as a rifle first.
