Aluminum receivers add balance and portability without sacrificing durability Authentically licensed Centurion Arms engraved trademarks Features the AEG 3 system to simulate recoil via a proprietary patented feedback system PTS Enhanced Polymer grip and stock increases ergonomics, comfort and includes storage compartments for small items Includes an Enhanced Polymer Magazine that switches between 30 or 120 round capacitySpecifications: Brand KWAOperation Electric AutomaticBuild Full metal upper/lower receivers with high strength polymer furnitureOperation Semi-Automatic, Full-Automatic w/ Functional SafetyMuzzle Velocity 370 - 380 FPS (w/ 0.20g BBs)Gearbox Version 2 (Metal)Battery 7.4v Stick LiPo (Not Included)Magazine Capacity 30/120 Rounds with Cut-OffHop-Up Yes (Adjustable)Inner Barrel Diameter 6.05 mmInner Barrel Length 294 mmLength 28.34 - 31.49 Inches (Retracted / Extended)Color BLACK 1X Rifle