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Are you sure it's the slide catch, and not the magazine?
Unless the hellfires are doing thing differently, I believe there's a piece on the magazine that will push the slide catch upwards, thus catching the slide. The tension to push the catch upwards is a spring on the magazine, and if the spring is too weak, it might be causing problems.
You can sort of verify this by pushing the slide catch upwards with your thumb, and racking the slide to see if it catches. If it catches every single time, then the problem might not be your slide catch.
Since you have two mags, you could also do a quick test to see if maybe one of the mags works better than the other?
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