Improved Gen 2 Batch of their SCX GBB Series Based on the Esteemed MWS ZET GBB System w/ MWS GBB Mag Compatibility Rattler Rifle Design Aesthetics 5.5-inch M-LOK Modular Gen 2 Handguard with Monolithic Picatinny Upper for Peripheral Accessories, Optics and Furniture Partial Ambi Fire Control System - Fire Selector, Charging Handle and Mag Release Accessible for Main and Off Hands Ambi QD Points for Slings on the Handguard, Rear Receiver and Stock Equipped with SS Minimalist Foldable Stock, a Unique PDW Pistol Grip and a 3 Pronged Tapered QD Flash Hider Manufactured by Salvo Precision CNC Aluminum Construct with Steel Reinforced Components Grey 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.