Glock 19 Mag Gas Capacity
 

For each time you fill up the magazine, how many rounds can it shoot? Does it just shoot the 20+1 bb's it has in the mag or can you reload the bb's without refilling the gas?

You can usually get between one and a half to three fills of BBs from one fill of gas, for nearly all gas guns.

Two minimum from the G19. (20rds each total, depending on how you load the mag and if you have chambered BB or empty.)

yup. 2 mags worth...i love it...

Just make sure that when you load it full, there is about half a BB's worth of distance between the follower latch and the notches on the outside of the mag. Load it too much, it'll press the follower down too far, engage the holding latch, and when you go to shoot it, your G19 will act like it's had a vasectomy............... it'll be firing blanks.

Uh... happened to me twice on that 330 foot ferry, was rather embaracing.