Remi 870
Glock 17
Ruger 10/22
Bushmaster AR .223
Go to go!
Umm, no. Bad choice
Ignoring the fact that Bushmaster isn't exactly known for quality, choosing an AR that is chambered for .223 doesn't make any sense. An AR-15 rifle chambered for 5.56 can safely shoot both 5.56 and .223 while one chambered for .223 can only safely shoot .223. Why would you buy a gun that can't use the 5.56 which is far more readily available?