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==== Gas spring ==== Some newer generation air guns incorporate a [[gas spring]] (commonly referred to as a ''gas piston'', ''gas ram'', ''gas strut'' or ''nitro piston'') instead of a mechanical spring. The spring itself is essentially a stand-alone enclosed [[piston pump]] without outlets and with pressurized air or [[inert gas]] (such as [[nitrogen]]) held tightly sealed within the [[cylinder (engine)|cylinder]]. When the gun is cocked, the gas inside the cylinder gets further compressed by the piston, stores [[potential energy]] and acts as a [[pneumatic]] [[accumulator (energy)|accumulator]]. Gas spring units require higher precision to manufacture since they require a low-friction sliding seal that can withstand the high pressures within when cocked. The advantages of the gas spring include the ability to keep the gun cocked and ready to fire for extended periods of time without long-term spring [[fatigue (material)|fatigue]], no twisting [[torque]] (caused by coil spring expanding) exerted onto the gun, smoother recoil pattern and faster "lock time" (the time between pulling the trigger and the pellet being discharged), which all result in more consistent accuracy. Gas springs perform more reliably in cold climates than coil springs, because metallic coil springs need to be coated with [[grease (lubricant)|lubricating grease]] which often thickens in low temperatures causing the gun to "freeze up". Gas springs also have less lateral and longitudinal vibrations than coil springs, hence are usually less "hold-sensitive", making it easier to achieve consistent [[shot grouping]]s.
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