Daniel Defense x Double Eagle Collab, Licensed by EMG Based on the Esteemed MWS ZET GBB System w/ MWS GBB Mag Compatibility 14.5-in DD M4A1 Design Aesthetics - Rollmarks, Licensing and Trademarks from Daniel Defense 12.25-inch Daniel Defense RIS II Quad Picatinny Rail System Civilian Variant of the SOPMOD Block II DD M4A1 Fully Functional Right-handed Fire Controls w/ Safe-Semi-Auto Fire Modes 14mm CCW Outer Barrel Threading w/ Birdcage Flash Hider Equipped with DD Licensed Bolt, Collapsible Buttstock and Pistol Grip Includes DD 35-rnd MWS GBB Magazine Manufactured by Double Eagle CNC Aluminum Construct with QPQ Steel Reinforced Components Black w/ Choco Brown Handguard Finish This product is only compatible with gas designed specifically for Airsoft guns. Do not use lighter fluid or butane gas, as that will cause permanent damage.