Quote Originally Posted by flenna View Post
I had a lot of time in a shoot house when I was with the PD- shooting MP5s, 12 gauge pumps, .45 pistols and AR15s. I can say that the 5.56 was abusive to shoot (we didn’t have suppressors) in small rooms although all the others were but not as bad. The MP5s seemed to be the less concussive than the others. I have a YHM Fatcat in jail that is going on my HD gun- the shorter overall length seems to lend itself well to shorter barrels.
There is also something about full auto (assuming you are using select fire) where the impulses of individual shots seem lessened depending on rate of fire.