Just a question to ponder. Over the past several years I have accumulated a few suppressors. I've even built a few on Form 1s. I don't have any intention to sell any of them, but at some point I began to wonder if it's really feasible to sell a used can. I've never seen a used can for sale, so I'm wondering if there are any market forces or legalities that make it too difficult or undesirable to sell or buy a used can.