I've been seeing suppressors more and more recently; are they already in "common use" from a legal standpoint? Headed in that direction? If those of us who live where suppressors are legal buy them (in compliance with the NFA and all other applicable laws), might it drive us to a threshold where they become items in "common use"? As I said on another thread, I'd be a lot more likely to jump through the hoops to buy a suppressor if I thought it would make it easier for me to buy more down the road. Posing this mostly as a legal question so I stuck it here rather than activism or NFA items.