British Army Designation of the KS-1 GBB Rifle, Recent Acquisition for the New Generation Standard Rifle for the British Army Rangers and Royal Marines Regiment Knights Armament Company x VFC Collaboration Licensing, Trademark and Rollmarks from KAC V3 GBB Rifle CNC Machined with Aluminium Housing, Reinforced with Steel Internals 13.7-inch Proprietary Dimpled Heavy Barrel with 12.8-inch URX6 M-LOK Handguard Fully Ambidextrous Fire Control System with Steel Reinforced Components KAC QDC Flash Hider Compatible, Fire Selector Controls and Iron Sights B5 Crane 6 Position Stock VFC First "EVO" Next Generation AR GBB Hop System, a Steel TDC Hop Up System Redesigned Machined Steel Bolt for Easier Maintenance Manufactured by VFC CNC Aluminum Construct with Steel Internals Construct Tan Finish This model is not available for sale in the United States. 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.