marine corp electric blowback airsoft pistol full auto & semi auto fps-180 aep automatic electric gun w/ hop up(Airsoft Gun) Features: Blowback Mechanism for a More Realistic Feel! Electric Powered (AEP) Can Switch Between Full Auto and Semi Auto! Motor Driven Blowback True 1:1 Scale! Adjustable Hop Up System Velocity (FPS): 180 with 0.12g BB's Requires 4 AAA Batteries to run (not included) Length: 8"