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This is 4.5 mm (.177 in) calibre pre-charged pneumatic (PCP) air pistol used in 10 m Air Pistol event. It was the first pre-charged pistol to use compressed air rather than CO 2 as a propellant. The air cylinder is positioned directly under the barrel and is normally filled with a SCUBA tank or a high-pressure hand pump to a pressure of ...
Modern stand pumps have multi-stage chambers and built-in air filtration systems and have overcome many of these problems. Using scuba-quality air decanted from a diving cylinder provides consistently clean, dry, high-pressure air. During the typical PCP's discharge cycle, the hammer of the rifle is released by the sear to strike the bash valve ...
Axelsson developed with a three-stage hand pump that alleviated this difficulty of refilling PCP airguns. In 1995, he took the ideas to a local company and started production of the hand pump. He then took the pump off the Independence rifle and sold it to Webley & Scott, which later became the Webley Axsor rifle. Around the same time, he also ...
Deep well hand pumps are used for high lifts of more than 15 m. The weight of the column of water is too great to be lifted directly and some form of mechanical advantage system such as a lever or flywheel is used. High lift pumps need to be stronger and sturdier to cope with the extra stresses.
PP – DXC pressure plot log [clarification needed] PP – pump pressure; PPA – Pounds of Proppant added; PP&A – permanent plug and abandon (also P&A [citation needed]) ppb – pounds per barrel; PPC – powered positioning caliper (Schlumberger dual-axis wireline caliper tool) [24] ppcf – pounds per cubic foot; PPD – pour point depressant
Red gas is usually avoided unless the airsoft gun has undergone modification, as its relatively high critical pressure can cause damage to the airsoft gun, such as breakage of the slide or bolt. CO 2, nitrogen, and high pressure air are less common because they need to be stored at higher pressures than "green gas" or HFC-134a.