that would be an interesting mod, like the 17hmr the 22 mag probubly doesnt have the kind of following to make a manufacturer step up and produce a kit and mags and all that would go with making a magnum conversion work. some version of a ciener bolt might work , bolt would have to weigh alot more and a heavier spring. then you have to find a clip that would work in a ar magwell with some adapter, and i think existing 22 mg clips are like only 5-7 rounds, so there again youd be starting from scratch for a high cap mag. and then top that off by shooting ammo that costs 3 times as much as 22lr and only half what 223 is. anyway would be fun but i dont see it happening unless you fab one up yourself. personally it would partially defeat the purpose to have one in 22 mag as opposed to 22lr. here you have a performance gain imo thats not worth the cost compared to just going with a 223/5.56 version. you would be better off finding a good bolt gun in 22mag or 17hmr for hunting at longer ranges and its a shure bet the 223 would be a better choice there.