Well that ain't no good...I have limited amount of information I can give you..but if you was worried about accuracy I would suggest a screw on can..and as long as it doesn't nick ( bullet hit a baffle or end cap ) it should group just fine..and if the for some unknown reason to man kind have to cut the end of your barrel off..do make sure to let them know that you want a crown put back on it..it isn't hard and brownells makes a lathe tool for it so don't take no for a answer..if you do your accuracy will suffer for it