actually you can get civilian type shotgun silencer its goofy as heck though and designed for use with trap loads and low velocity urban waterfowl loads. in screws in the end of the barrel like a choke tube but it adds over 2 feet to the length of the barrel, the way it works is from the length of it and the seires of ports it has all the way to the end, its muffles a trap load down to about the equivalence of a 22 cal starter pistol. the only thing better would be a cross bow. good luck