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The MEC M-Valve which can manage to increase gas efficiency.
Constructed from high strength brass, it also minimizes gas loss to fasten the entire cycling.
Performance is more significant with steel slide pistol.
Compatibility: TM G17 (Gen3, 4), G18C, G19 GBB / WE G17 GBB / VFC HK VP9 GBB, SIG Sauer M17 GBB