If your Western Arms or G&P GBBR magazines are leaking, or seem to have a lack of power, then it may be time to replace your stock magazine valve. The G&P Western Arms M4 Gas Magazine Reinforcement Valve is significantly stronger than the stock valve, is capable of supporting higher gas pressures, and provides your gas blowback airsoft gun with a more consistent gas output per shot.
Model: M4 Gas Magazine Reinforcement Valve
Size: Fits M4 GBBR magazines
Package Includes: One valve
Can support higher gas pressures
Provides more consistent gas output per shot