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Compare them side by each with your hi-cap. Chances are you will see some differences in where the mags are supposed to catch.
My King Arms mags for my G3A3 were 'fully' compatible according to KA but when you measured them with calipers with my Hi-caps they were out in several areas. In fact they were so out in one direction they were more apt to break the magwell than fit right. In particular to your issue, the mag lock 'groove' wasnt in the right place so the mags wouldnt lock ( as well as several other issues which I had to alter with a belt sander and a Xacto knife)
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