Auto sear/RDIAS/LLNice one!
I thought a 3 stamp was a myth. Once you get the MG stamp, it can be an SBR, and the MG stamp supercedes anything but one for a suppressor since it is separate. If you have a MG lower I thought you could put any upper on it (matching the caliber listed on the stamp). Corrections are encouraged.
Whaaaaaaaa i want stamps!!!!