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