i want a 22lr singe shot and was thinking about getting a barrel for my .410 that i could switch out . would it be safe ? i can have it fitted by a local shop so that's not a problem . would like some info about a 20 gauge barrel too i cant seem to locate a single shot 20 or 12 gauge single shot that is not over priced , would one of those barrels be safe ? i have nothing against the .410 , its my fav shotgun but i would just like to have some options . and were would i be able to find one of these barrels used for a good price ?