Dangerous situations can't be predicted, and that's what makes the P2P HDP (Home Defense Pistol) so indispensable. It's easy to load and easy to shoot. Plus, it comes with CO2 cylinders, pepper balls and rubber training rounds, so it's ready to go, right out of the box. Snag-free ergonomic design for quick deployment Tool-free Quick Pierce knob (bottom of grip) activates 8-gram CO2 cartridge with a firm tap Intuitive channel sight system for fast target acquisition Internal magazine holds 4 rounds of .50 caliber ammo 410 FPS muzzle velocity using .50 caliber rounds Accepts pepper, dust, or rubber rounds