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Ver.2 9mm Bearing Reinforced Gearbox with M4 / M16 Selector Plate and Bearing set

1 Customer Review

by warut h. on 10/13/2010
"This thing is very good for you are go low fps to make it shoot faster for cqb. i have in my m4 with m90 spring and good air seal and the matrix turbo motor it shoot out about 25-30 rps and the fps is 325 to 330 fps. if you are like me get this gear box and you will feel i love with your gun