Paintball marker accuracy is dependent upon multiple factors. Primarily, the condition and quality of the paintballs. Quality tournament grade paintballs stored away from sunlight and within a regulated environment free form extreme temperature fluctuations, and humidity will fly the straightest. Additionally, the length and condition of the marker's barrel will inversely affect the muzzle velocity. Lastly, the consistency of the marker's propellant system will determine the repeatability of muzzle velocity in follow up shots. Compressed air in general produces less variability, shot to shot, than CO2. Temperature variations will alter the pressure within a CO2 tank while a compressed air tank is essentially unaffected by the environmental conditions it is generally accepted that compressed air will produce more consistent propulsions compared to CO2.