Hastings used to market their "Metro extension", which was a 3 feet long barrel extension that screwed into the choke thread at the end of the regular barrel. While not absolutely quiet, it does muffle the noise enough to make hearing protection unnecessary. While long, it is not altogether unwieldy for stationary use. It's original intent was for things like geese control in city parks. Got to shoot a Beretta 391 with one - swung nice on crossing targets