I'd love to do some upgrades to some of my toys. But I'm very confused on this stamp business. I understand what is legal or not legal without a stamp. But let's say I want a silencer on my sig, i buy the silencer pay the 200 tax stamp. Am i only allowed to use the silencer on the sig? Or can i move it around other guns as well? Do tax stamps apply to the handgun or to the silencer? Say I sbr something. Is there a separate tax stamp for adding a silencer as well or no? Transferable mg?