OP, I just went through all of this with my Loaded 9mm.
Tripp Research Cobras work fine, but I still needed to change the slide stop with a Wilson 'Bullet Proof' slide stop to make the gun run flawlessly for IDPA matches. (Slide was not locking back on empty mags)
The Wilson mags didn't work until I replaced the springs with the same springs used in the Tripp Research mags.
Here's my thread about the issues I had.
Tripp Research Cobras work fine, but I still needed to change the slide stop with a Wilson 'Bullet Proof' slide stop to make the gun run flawlessly for IDPA matches. (Slide was not locking back on empty mags)
The Wilson mags didn't work until I replaced the springs with the same springs used in the Tripp Research mags.
Here's my thread about the issues I had.

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