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For AIRSOFT Use ONLY! Compatible With VFC M4(20rds/30rds), HK416, VMAG GAS Magazine output valve.
Compatible With VFC M40A5 GAS Magazine output valve. Compatible With DNA, CAR M16, M4 GAS Magazine output valve.
● Material : Rubber.
FEATURE: ● 3 pack O-ring of VFC M4/HK416 GBB series gas magazine valve. ● Suggest user to change output valve o-ring after using magazine over a year. ● Using silicone oil to lubricate the o-ring part well, can improve air-tight of valve.