I shot a full auto mp5 with a silencer yesterday...it's not that cool. First off the silencer isn't that quiet, it sounds like a deeper .22LR and at full auto is very noticable. The thing is pretty inaccurate, but the one I was shooting was old and used to hell. On single shot I couldn't get that great of a grouping. The first 2 shots would be close and then the 3rd was out in left field. We put 300 rounds through it and at the end it was like boiling hot and smoking. So if any one you always wanted to shoot one, like I did, it was quiet disappointing.
. I still want to try out a M4A1 with 3 shot burst, but I'm not that excited anymore.