Just for the UMP look, suppressors are not an option yet here in IL although we're working on getting the law changed.I got to ask, but why? There are not good flange mount suppressor options on the market. Go with threaded or if 9mm then 3-lug.
I was considering it, just wanted to keep the original HK barrel in the rifle.Why don't you get an HDPS barrel?
HOMELAND DEFENSE AND POLICE SUPPLY CORP. (about the middle of the way down)