"I guess in theory this piston is alright for low stress situations (like low feet per second and a 9.6 or below battery). For me this piston sucked. The METAL teeth cracked on it after only 5-6K rounds. That's around your standard bag of BB's. I was using an 11.1 lipo at 380 FPS. So again, I guess it could work for some setups, but I would not risk it."