Lonex Aluminum One Piece Metal Hop-Up for AK Series Airsoft AEG Rifles

"Way better than the stock plastic unit. However, you will need to file down the lever to your desired resistance. After that, though, it's smooth sailing. You can even tighten down the screws to lock the adjustment arm in place.

"Nice feeling hop up unit. The arm may be too big to slide when you get yours, but there is a purpose behind this. You can file down the blue arm to the resistance you want. Over time, the vibration from the gearbox may move your adjustment, but keeping the arm thick allows the adjustment to resist unintended movement.

"Nice feeling hop up unit. The arm may be too big to slide when you get yours, but there is a purpose behind this. You can file down the blue arm to the resistance you want. Over time, the vibration from the gearbox may move your adjustment, but keeping the arm thick allows the adjustment to resist unintended movement.