supressor
reality, wouldnt work the pvc and the foam actually amplify the sound, it's hard to describe, tried it, and no spray foam doesn't help either, potatoe's still works onna .22 tho, lol. shotgun, an A.O.W is the smallest, aow=any other weapon, most require a tax stamp, and the NFA rules will apply, As for the full auto biz, the class 3 license, most of what you will spend is time. A tax stamp for each firearm that's full auto, and of course you hopefully not being a felon, will allow, local PD, Sheriff, FBI, ATF, or any other agency into your home at any time to check on you, at any time they wish, and all the record keeping books you'd be req'd to have etc etc, if ya have lotsa money and time tho, go fer it. check the atf i posted, request the necessary forms, they mail em to ya, dig into yer background super deep, and then ya wait fer approval, after sending in the appropriate fee's, and paperwork, one of which has to be approved by your local chief law enforcement in yer locale.