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Table 1 Airgun power sources

From: Carotid artery injury from an airgun pellet: a case report and review of the literature

Power source Mechanism Muzzle velocity
Mechanical piston
Spring piston Spring loaded piston 1200 ft/s (370 m/s)
Gas ram pressurized air/nitrogen built into the piston  
Pneumatic
Multi/Single stroke require pre-compression of air into the chamber using an on board lever 700 to 1000 ft/s
Pre-charged pneumatic (PCP) Filled by decanting air from a reservoir to pre-compress air into the chamber  
CO2
CO2 require a disposable pre-filled cylinder of CO2 400 to 600 ft/s