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SPECIFICATIONS COMPATIBILITY: M4/M16 VERSION 2 GEARBOX FITMENT: V2 JACK AND F1 CYLINDERS COLOR: GREEN MANUFACTURER: POLARSTAR FEATURES COMPATIBLE WITH VERSION 2 JACK F1 CYLINDERS DESIGNED FOR USE IN V2 GEARBOXES (M4 / M16 PLATFORMS) PLACE ONTO POLARSTAR FUSION ENGINES THAT TAKE AEG SELECTOR PLATES PROFESSIONAL INSTALLATION MAY BE REQUIRED OPTIMAL OEM COMPONENT IS PERFECTLY COMPATIBLE