KUNG FU Airsoft Hop Up Bucking for Marui GBB

KUNG FU Airsoft Hop Up Bucking for Marui GBB 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 It is time to change a new one. Packing has the tolerance against hot exhaustion that causes hardening and deterioration Improve shooting accuracy, air-tightness & firmness Suitable for Marui Airsoft Gas Gun / GBB Rifle models