Got this a few days ago because i just got back into paintball from about 5 years ago. First game i played with my minimag, i chopped a ball and didn't shoot right the rest of the day. If your upgrading an old gun might need an oring kit, i did. The Mag valve i have is old so it took some time to tune and the dude on tech support really helped, also alot of good forums on automags.org Like it says do not expect to drop this in, it does take tuning although the outcome is well worth it. Almost never chop a ball again
Great product, takes some time to tune. 
