marine corp electric blowback airsoft pistol, semi automatic fps-180 aep realistic blowback, hop up(Airsoft Gun) Blowback Mechanism for a More Realistic Feel! Electric Powered (AEP) Semi Auto! Motor Driven Blowback! Adjustable Hop Up System Velocity (FPS): 180 with 0.12g BB's Approx. Length: 8", Requires 4 AAA Batteries to run (not included)