bought the 30rn mag for the glock 40cal aftermarket mags, Glock dont make one for the 40 but they do for the 9mm.
Man what a pice of junk, took it out to the range and it jam every round, when i loaded the mag the spring was stiff and it was hard to put ammo in it after the 10th rd. I pay $30 for it at the tanner gun show. I wish glock would come out with one for the 40's, so if who ever own a glock in 40cal and want a 30 rd mag dont buy it. cheep korean made S%#!.