There's a lot to be said for not ever having to scrape carbon off of a bolt. I run an Osprey Defense piston conversion in my own carbine and have installed over a dozen of them without a single hiccup. No permanent modification to your rifle, no valves, no springs, no changes to be made for blanks, cans, or caliber change. It just runs, guys. Shoot me a PM and I'll hook you up with the best deal on one.
