Raven Evolution Ore AK AEGs features metal and real wood construction, side clamp mount full metal v3 gearbox, 18:1 steel gears, 8mm ball bearings, bearing spring guide, quick change spring, high torque motor, and a 6.03 brass inner barrel. The Raven Evolution AK TAC is the modernization of the classic Russian AK rifle. Built with a metal body and features full metal m-lok handguard and folding fixed polymer stock. This AK-TAC is wired to Deans in the dust cover, features an adjustable slider hop-up, optic side mount, and an all metal gearbox. Weight: 6 (lbs) FPS: 380 – 410 FPS (Measured with 0.20g BBs) Length (Stock Retracted / Extended) : 28 / 37.5 in Inner Barrel: 340 mm – 6.03 Thread: 14mm Negative Hop Up: Metal Slider type adjustable Gearbox: Ver 3 Full Metal, Fully Upgradeable, Quick Change Spring Motor: Short Type Mosfet: Raven Evolution V3 FURION, Trigger Programmable, Optical, Micro Switch, Magnetic Battery: 11.1V recommended