Modify Reinforced Fill Valve Marui GBB

Made of Micro-Lead Free-Cutting brass that is harder than the standard, the valve body is more resistant to impact, corrosion and durable all round.
The CNC machined SUS303 nipple is harder than typical brass to resist deformation. The shorter extended tube increases the maximum gas storage capacity.
Suitable for Tokyo Marui GBB mags, and other Japanese brands (KSC, Maruzen, Marushin)