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For: CYMA M14 AEG GearboxProduct Information:
Nothing real special - just a standard replacement gearbox. Pretty decent quality though (see pros and cons below).
Version 7 gearboxes are known for their durability
Full cylinder which is a must for long barreled rifles
Metal 6mm bushings
Stock spring is rather weak - only getting 330 FPS in the SOCOM I installed it in.
Motor isn't that great, but works okay with the stock spring.
7mm bushings would be better, but at least the 6mm ones it comes with are metal.