LOL! Yeah, it’s one of those “Is it safe to shoot .223 in it or only 5.56 cause it explode in my face” deals. The mini is way tough enough. I seem to remember a thread quite a while ago about chamber pressures for both but don’t recall the details. If I remember correctly the .223 has higher pressures. I’m sure someone will educate me/us once again. So, thanks in advance :>)
I think 556 is the military round and has the higher pressure. If it safely fires 556 then it fires 223 but not vice versa.
The “NATO” designator means the increased powder for higher pressures.