airsoft pellets are propelled 3 ways
well, 2 actually, but there are 3 categories
gas - commonly hfc 134a or hfc22...similar to the stuff found in computer air-in-a-can dusters
blowback guns recoil with a force similar to a .22 rifle
nonblowback, well...doesnt blow back with each shot
spring - ranges from the cheap pistols to the crazy expensive tuned sniper rifles
electric - uses a battery to wind gears, working a spring which is connected to a piston, using air to propel the bb
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