hfc t77 full metal body semi/full auto green gas blowback gbb airsoft smg w/case(Airsoft Gun) Realistic Heavy Weight, Realistic Blowback Action (Gun Kicks Back Like a Real Gun!) Full Metal Body, Fires in Semi & Fully Automatic Adjustable Rear Sight, Build-in Hop Up System Functional Safety Switch, Metal Folding Stock Shoots an amazing 320 fps with a 42 round magazine capacity.