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