To date, every single instance I've seen a TTI extension puke rounds, it's somebody slavishly following the recommendation to not tighten that pin set screw. This, despite the fact that these things consistently arrive from TTI with it set to utterly different tensions. Sometimes the pin can be easily moved with finger pressure, sometimes it needs to be pushed with a punch or against the corner of a table or the like. I prefer the latter.
They have threadlocker on them, and I've taken to installing mine by loosening the set screw, then re-torqueing it to 25 in-lb once I've installed the thing and set the pin in place. I'm not one of those who constantly disassembles mags to clean them, and I think that contributes to them staying secure because they're not being constantly diddled with.
*break*
The extensions themselves don't contribute to auto-forwarding. It's a 2nd-order effect of the tacit change of how the force applied to mag insertion travels the frame; strong chance it'd happen with similar extensions of other brand. You've effectively altered the gun somewhat, in material and measurement; a lot of us have experienced that sort of thing affect function, for example, when it comes to cuts or spring weight changes in a slide.
Contractor scum, PM Infantry Weapons
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