I've been looking at these for a while. Seems like too good of a deal to pass up. But the one thing holding me back is what appears to be too short of a barrel to put a suppressor on. The rails on all models look like it will protrude just past the threads prohibiting screwing a can on it. My current pistol ca is the osprey 9, which cannot do tri-lug. Is there an extension that you can get to extend it enough to thread on directly ?