MAXIM Defense x VFC Collaboration of the MD:9 K PCC Rifle SBR Configuration, Compact Pistol Calibre Carbine Platform Includes MAXIM Defense SCW Gen7 Stock, M-RAX Hand Stop and Steel HATEBRAKE Muzzle Brake Free Float MAXIM Defense Handguard with Single M-RAX / M-LOK Slot Compatibility Texturised Magwell for Additional Magwell Hold Grip Option CNC Aluminum Lightweight Bolt Carrier Set Ambidextrous Mag Release and Charging Handle 14mm CCW Outer Barrel Threading Compatible with VFC / Umarex (Elite Force) Glock 17 / 18 / 19 GBB Magazines Licensing, Trademarks and Rollmarks from MAXIM Defense?Alloy Construct Black Finish Maxim Defense MD9 GBB Part Diagram Maxim Defense MD9 GBB Manual 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.