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FCC advance hop up complete set bring your TW with better adjustment in hop up.
Original hop up from PTW were using plastic adjuster cushion, due to difficulty to get perfect adjust.
We modify with custom made spring to replace cushion. It increase the senstive of adjustment and also enhannced Hopup rubber roller equipped. Advance Hopup Barrel Key included, for disassemble the hopup system just like a piece of cake!!!