If you can manually lock back the slide (rack slide to the rear and make sure the slide catch engages) with no mag inserted then the problem lies within the magazine itself. There is a little tab on the BB follower that pushes the slide catch up when the magazine is empty.
If that isn't the issue there is a good chance the slide catch is worn (unlikely) or a slight manufacturing defect. It will take standard TM Hi-Capa parts with little to no modification if the catch is the issue.
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