before i upgraded my G19s i tested the gas efficiency of my G19s. I tested them in room temperature around 21-22 celcius. a full mag of propane (3.5-4 second charge) using .20 BBs with a bone stock KSC G19. I fired each BB with 2-3 second intervals and i managed to get 4 and 1/2 mags worth of BBs on a single fill of gas.
Now my Glocks are modifed with HurricanE tune-up kits, with metal slide and barrel. and on average i get 2 to 2 1/2 mags of BBs in room temp.
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