I used to have the same problem after I got my inner barrel upgrade. The inner barrel was getting pushed back causing the mag to not properly secure. I discovered that the end cap was putting a lot of pressure on the inner barrel (edgi barrels are made slightly longer than the stock barrel), which causes this misalignment. Didn't occur often, but it was an annoyance. I fixed it by putting an o-ring at the tip of the end cap, which gave it about 1-2mm of space and greatly reduced the pressure.
Don't know if this is a valid fix or not and not sure if anyone else has a similar problem, but it works well and does not affect the aesthetic appeal of the rifle.
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