CYMA Rotary Style Hop-Up w/ Bucking for M4/M16 Series Airsoft AEG Rifles

"Bought this to replace a plastic Classic Army Nemesis MK18 plastic hop up. The original was fine I just wanted to find a suitable replacement if I ever ran into issues down the road. Sanding on front of the unit where the plastic barrel spacer sits was required. Solid lockup and stable FPS readings were achieved with this unit. I applied grease on the o-rings and the center of the wheel to make adjustments easier. Better than a MAXX.

"Bought this since the plastic unit in my Warlord was wearing down. A bit hard to adjust, but it feeds great. So far it's holding up really well.

"These seem to hop very well and stay in place. With that being said... rotary hopup dial extremely hard to adjust but worth the $

"It’s ok. If your on a tight budget you with be fine as long as your not using Krytac mags because in my experience they don’t feel well. The rotary mechanism is extremely hard to turn as well, other than that it’s fine.