@dannyb
My mates JW15 had annoying feeding issues from new, I ended up changing the angle of the mag lips by bending them with pliers, and filed the edges a bit to get the rounds feeding right. It just took some looking closely to figure out what was happening first, and then a bit of trial and error to get it right.
From memory the problem with that one was the lips holding the back of the round too low and letting the front pop up too high, so it would often stovepipe or hit above the chamber instead of going in. If the problems are caused by lack of quality control then yours might be doing something different, but watching how the rounds pop out of the mag while the bolt is being cycled is a good place to start.
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