Be Prepared 2 Protect with the P2P HDP 50 Compact .50 caliber CO2-powered personal defense device. The 8-gram CO2 cartridge is instantly activated with a firm tap of the Quick Pierce knob on the bottom of the grip frame. With the CO2 cartridge pierced the shooter can quickly acquire and engage their target via the intuitive channel sight system. The internal magazine holds 4 rounds of .50 caliber pepper, dust, or rubber ammo. Comes with rubber and pepper rounds.