I have the same Star ak74 mid cap mags (160rds) for my TM ak beita spetsnaz and I have the same problem.
First I had to file the mag just to be able to insert it in the magwell (it was too big) now it fits nicely but it wont feed. I am sure it is the same issue you are having. I will try and fix this. If I succeed I let you know.
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