I'll echo Jim's sentiments on silencers on 7.5's. I've run thousands of rounds with an Ops M4s and an Ops 15 attached to a 7.5", and have had no issues of any sort. When I called the guy who made my cans, his only suggestion was that I use the brake mount instead of the flash-hider mount, as it takes the brunt of the abuse and is the stronger of the two.
