No gun plumber here, but I would separate the upper and lower and try inserting the mag into the lower and push up mag like it might be when using it as a mono pod. If the mag goes in deeper than the normal notch, I'd try putting another twist or two on mag release. If that does not work, I'd try another mag release. I have a bunch in a bin. When you look at many side by side you will notice that they have some variation from part to part. Look for one with a lil longer hook to hold mag in place if that makes sense. I might also try another mag release spring....
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