[MADDOG]

I had this same issue with my AK beta project. What I did to fix it was quite easy and resulted in very tight mags with little wobble or play and they fed reliably every round in every AK I own.

I shimmed the mags with small layers of plastic (hot tub chemical test strips cut down) underneath the actual mag lip on the rear of the mag (see Pic). I added a couple on millimeters of material with crazy glue and trial fit each mag. This forces the mag up higher and deeper into the mag well when the magazine release catch comes forward. This ensures the hopup is fully inserted into the mag and removes mag wobble. You can shave the plastic to give it a slight ramp and now you have mags that feed140 rounds without a hitch.