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Is it chrome plated? I think the TM ones have a hard chrome finish which gives it good sliding lubricity. A plain aluminum part would slowly wear away the anodizing in the frame and bind in the frame. TM's firing pin lock may be crappy cast aluminum, but their chrome finish performs very well. I have had much less wear with my chrome plated Hicapa parts than with my plain aluminum WA trigger parts.
That part is not heavily loaded. All it does is pop upwards when the firing pin is pushed forwards by the hammer and latch the firing pin forwards until it's pushed back down by a surface in the slide to unlock the firing pin. I suspect that your part may have had a casting defect to start with. How old is your gun?
TM has much better material selections than most GBB brands.
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