Yes, there is a flat spring on the right side with a hook in it that sticks inside and bumps the rim when it gets that far back, sending it flying. Sounds like you are "hookless".
Closeup photos of the thin metal strip on the right rear side of the gun, and inside looking down on the mag well with the toggle back will help us.
But it sounds like you have found your problem.
Good job!
dju
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