Im really just doing it for the cool factor. Im not really concered with velocity as much as i am sound reduction. I shoot mostly 115 grain, so i like that it will lower the velocity to subsonic. Just a fun rifle. I think the intergrally supressed design is a cool idea.
If anyone sees any MP5SD rifles a swat team wants to get rid of, Id gladly take one of those instead.
Thanks for the info.