A.P.S. Durable Hop-Up Rubber w/ Cushion for ASR Series AEG
Suitable for ASR Series Airsoft Electric Gun AEG Rifle
It is fully compatible with aftermarket airsoft guns using TM compatible hop up unit
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.