WE GP1799 T5 Black Metal Slide Silver Barrel GBB Pistol ( BK ) - Full Metal Construction Slide (Black) and Outer Barrel (Silver) - ABS Frame (Black) With 20mm Under Rail - Optical Fiber Sight (Rear Sight Red color) & (Front Sight green Color) - Gas Blow Back Pistol with Semi-Automatic Shooting Mode - 24 Rounds Loading Capacity - Adjustable Hop up