A.P.S. Hop Up Rubber for ACP601 GBB Pistol (3pcs Set)
This rubber has high quality which generate good hop up effect for your pistol.
Suitable for A.P.S. ACP601 Series Airsoft Electric Gun AEG Rifle
It is fully compatible with aftermarket airsoft pistol using similar system
If your hop up adjustment is not having a significant effect on the hop up of your BB, your hop up packing is probably worn down, so, It is time to change a new one.