Hi Storm, I am terrible at pictures and trying to post them, but you can load a few rounds in the Mec-Gar and when looking at it from a profile view, just notice the bullet angle in comparison with the feed lip top edge angle.. they should be parallel, maybe just a skosh of the bullet front being a bit higher?? Make one of your problem mags hold the bullet the same way, same height, etc. and see if it helps?.. Best, til....lat'r.....GT....
BTW, field strip your Luger, remove the hold open and seat your mec-Gar mag in the frame just as you would if you were loading it. Pull down so that you are sure it is firmly on the mag catch, and see where the bullet sits when looking across (profile) in relation to the frame rails, or ramp, or any other frame referance you migh better use?.. Best, GT....