Lonex Metal M4 Hopup Unit

Well, for $16 you can't go wrong what so ever. Everything is well made and fits extremely snug. I was really impressed with the hop-up arm itself with being absolutely no play while in the hop-up itself. (No wiggle room for inconsistent shots) I have this unit paired with a lonex hard bucking, R hop, and an M nub and was hitting 250ft with ease during my initial tests. Provides great feeding as well. My mags sit perfectly in the unit and mag well. (G&P Body). Overall I couldn't be happier and actually think this out performs my ProWin unit.