Military Ammo/Civilian Rifles ?

There are slight but potentially problematic diffferences between the military rounds and their civilian counterparts. Just about all "assault rifle" style rifles today will accept either, except tight-chambered custom jobs intended for varmint or target work. The average sporter, though, will have the somewhat tighter-than-military chambers which can lead to trouble with military ammo. Of course, rifle chambers do vary a bit, and there are probably sporters out there that will be fine -- but sticking cases would be a sign that something is not right.