The easiest method is to get a 5.56mm suppressor and attach it to your AR-15. Then get a .22LR conversion kit, install it in your AR, and have fun. I routinely go back and forth from 5.56mm and .22LR in my AR plus M4-2000 suppressor with no problems and no "lead build up" like so many people claim. Trust me, after a mag or two of 5.56mm any lead build up in your silencer is going to be vaporized. My silencer gets so hot when shooting 5.56mm I can see heat mirages through my optic.