VFC Gas Output Valve O-Ring Set

Specifications:
● Material : Rubber

Features:
● 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.

NOT compatible with CO2 fed magaiznes!