I have the .22 mini, By advise from a police chief friend of mine first round is a shot shell, followed by fragmented 3 piece rounds. In Garland TX 2 years ago I was in a Hotel, when going back out to my car in a pair of shorts, left my .45 in the room and picked up the NAA, when Hispanic male tried to rob me with a knife, the shot shell was all it took, left him in the lot holding his inner thigh and privates and crying. Did not need to make a one shot kill, and said robber had one way ticket back home, .45 is my choice but why bring a knife to a gun fight. NAA is better than nothing, last ditch BUG gun, just my thoughts