Pop rivet the cap in Isit? Any I'm fed up of looking Dar , I'm just gonna ring up a and m , see if they will polish internals and have a Fucj about with it to try squeeze few more shots out of it..have them to lob off 5" and wap on a marksman , because their suppose to be quiet, only way to find out is first hand experience lol and iv owned a few silencers, parker gale, mk5, Hw , vc ..so il just see for myself lol any idea how much a an m charge for lobbing 5" off? Lol