Redwolf Custom Design of the SIG AIR Proforce M17 Pistol with Custom Aluminum Slide and Cerakote Finish One of 2 Angular Ported Slide Design, Lightened Slide Weight and Exposed Steel Outer Barrel Design Tapped Outer Barrel - Thread Adapter 11mm CW to 14mm CCW, Tracer Ready Interchangeable Optics Plate Ambidextrous Slide Release and Safety, Swappable Mag Texturised Mag Release Flat Lightweight Trigger, Short Trigger Travel and Light Wall Break Picatinny Lower Rail for mounting of Peripheral Accessories Adjustable Hop Up with Recoil Rod M18 Style, 21rnd of 6mm Magazine Capacity Dual System Ready (Green Gas and CO2 Ready) Aluminum Construct with Steel Reinforced Internals Hillbilly 223 Certified Cerakote SIG Dark Grey (H-210) 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.