In MS silencers are ok if proper documentation. One of the most fun rifles to shoot is a silenced M-16 with a 22LR conversion. The ciener,(sp) kit works well in the full auto mode and you can afford to shoot a few bricks at the club. Its fun to pull the trigger and just hear the bolt slap back and forth then hear the projectiles hitting the target downrange. Another plus is not having to look for the brass.
A minus is how dirty it shoots. We have dedicated uppers for the conversions so we don't have to worry about cleaning the gas tubes.
