In the 52 both mags work fine except, the 39 mag does not hold the slide back on the last shot.If you try to put the 52 mag in the 39 it won't go in? I changed these around a couple of years ago and I cannot honestly remember (old age) how It fired or if I even tried it.God willing I'll get to try it out in a couple of weeks and I'll let you
know.