In like new condition. Features Include: Quick release spring and spring guide for easy power adjustment & spring replacement Microswitch circuitry improves electrical contact performance Fast trigger response design Functioning spring release Reinforced metal gearbox shell 8mm metal bushings Low-resistance silver wiring Sintered steel gears Manufacturer: Matrix Specifications: Compatibility: The Matrix Transformer Gearbox will work with most M4 AEG platforms (modification may be required) Barrel Compatibility: Will work with barrels from 250mm-590mm in length Spring / Power output: M120 / ~400 FPS Check my page to see if there is anything else you need! I will accept reasonable offers I will combine shipping on multiple orders when possible