New Walther PDP GBB Airsoft Pistol Series from VFC/Umarex Walther Authorized Manufacturing and Rollmarks High-Quality CNC-Finished Cast Aluminum Alloy Slide Enlarged PDP-Style Slide Front & Rear Serrations Red Dot Optic Ready Design; 4 Optic Plate Adapters: Trijicon RMR Footprint, C-More Footprint, Leupold Footprint, Vortex Footprint Fixed Outer Barrel Design for Increased Overall Accuracy and Consistency Adjustable Windage & Elevation Rear Dotted Sight (3 Dot Sight System) Independent Dummy Extractor Ambidextrous Slide Stop Lever Guide-Hop Quick Hop-up Adjustment System Fire-Control Assembly Comes with Self-Lubricating Surface Treatment Increased Cylinder Size for Stronger Recoil Impulse 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.