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The APS HYBRiD Gear Box is a new bench mark in the airsoft industry due to the fact it offers a reliable electric blow back function with a locking bolt catch and to make it even easier to upgrade it uses a quick change spring guide. The electric blow back function uses the movement of the piston to pull back and match the cycling of the piston to add the realistic bolt movement. This does not strain the motor or gears in any way since the moving bolt is a light weight alloy and the reinforced gears that are housed in 8mm steel bushings are ready for a lifetime of shooting. the HYBRiD gearbox is producing over 360 fps with a .20 Echo1 BB and can be easily be upgraded or downgraded with the quick change spring guide. The spring guide is made out of steel and uses a set of bearings to allow a smoother cycle of the gearbox. Overall the APS HYBRiD gearbox for the M4 is a solid investment will all the features you could need while keeping the cost reasonable.

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