You have to get the feel for it. It's harder to put the AK mags in correctly than in an AK. I always put it in with the front edge of the mag pointed vertical. I push upward then slide forward and do the normal rocking into place. You also have to make sure the catch on the mag is centered correctly. I usually have to look at it when I'm doing it. Also, if you replaced the original stock with a thumbhole, that may be part of it. The mag well is integrated into the stock. One thing I don't like about it.