Features: + High Strength Nylon Reinforced Polymer Lower Body + Aluminum Alloy Upper Body + Metal RIS Front End + Steel Alloy QD Barrol System + Tightbore Precision Inner Barrol + Ambidextrous Selector Switch, Controls, and Handle + Retractable Folding Shoulder-Rest + Integrated Adjustable Cheek Riser + Full Length Top Rail for Optics + Adjustable Flip-up Front and Rear Sights + Newly Designed Hopup System for Optimum Accuracy and Range + Integrated QD Strap Swivel Mounting Points (Strap Swivel not included) + Mock Gas Adjustment Knob for Extraordinarily Realistic Detail + Reinforced Metal Trig. System + Metal Cycling with Hard-Kick Recoil Spring + Realistic Hard-Kick Blowback System with Locking Cycling Mechanism Length: 685mm / 855mm - 930mm (Folded / Adjustable) Weight: 3300g Inner Barrol: ~400mm Mag Capacity: 30rds. Works with WE-Tech and other compatible M4 Series GBB Airsoft Mags Muzzle Velocity: 399-435 FPS (Measured w/ .20g BB) Thread Direction: 14mm- Gas Type: Green Gas, Red Gas, Propane Fire Modes: Semi/Full-Auto, Safety Package Includes: Gun, Mag Hopup: Yes, Adjustable Manufacturer: WE-Tech