You will need a Glock 19 magazine (flush 15 rounds), Glock 17 magazine (sticks out a little and 17 rounds), or a Glock 18 magazine (stick out a LOT and 30 rounds.)
You will need a Glock 19 magazine (flush 15 rounds), Glock 17 magazine (sticks out a little and 17 rounds), or a Glock 18 magazine (stick out a LOT and 30 rounds.)