Replica of the popular Mp5K SMG used SAS, GROM, GEO, Alpha, GSG 9, Navy SEALs, Delta Force, GIGN. The receiver, barrel, sights, magazine release, fire selector lever, trigger and magazine are made of metal alloys. The pistol grip and the front grip are made of polymer. The mechanism is a Gearbox v3 with a quick spring change system, steel gears, an adjustable hop-up system, and a 6.03mm inner barrel of 130mm length.