g43 mags are known to be marginally reliable w HP ammo, likely due to light and fast slide velocity. They are prone to nosediving. Any extension of baseplate, even the smaller +1’s exacerbate the problem. such has been my experience w the G43 and 43x. The 48 is slightly less sensitive. This has been discussed ad nauseum on pistol forum and my interpretation from those who put shit tons of rounds through their glocks is to not F around w mag spring tension at all. If it’s a race or fun gun then whatever.
mag Spring tension is critical for function and on striker guns like glocks it’s even more important than on a hammer fired. the issue has nothing to do with TT products.
if you decide to put mag extension on an EDC pistol, suggest running a box of HP’s through it before calling it good. Then do again when the mags have some miles on them.
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I expect no less than 20 uninformed opinions on the matter here.