Realistic Blowback Action - Authentic Look & Feel - Semi-auto repeater - Drop-free 16-shot BB magazine - Powered by one 12g CO2 capsule housed in the mag - Fixed front and rear sights - Metal barrel - Specs - Brand: Heckler & Koch - Velocity (FPS): 325 FPS - Caliber: 0.177 (4.5mm) - Ammo Type: Steel BBs - Barrel Length: 4 - Total Length (inches): 7.75 - Capacity: 16-Shot - Front Sight Type: Blade - Fixed - Rear Sight Type: Notch - Fixed - Action: Double/Single - Power: CO2