Re: FP Snapped While Dry-firing
As a guess. Bad metal & or heat treat, compounded by a stress riser where the pin becomes hollow. That, & I can't help but wonder if the pin might have been a touch out of spec length wise, & the result of said mis-sizing became apparent on shot #275. Kind of late for measuring at this point, but just another thought towards contributing factors.
It'd be interesting to see what the rest of the hollow bit looks like sans bluing, & after some dye penetrant was applied. Assuming the manufacturer wants the broken bits back in their current state. IE: with the OEM finish still on them.
Might be worth doing on the non blued bits, dye penetrant that is. And or putting said pieces under some magnification. Dare we ask what make of pin it was? And stock spring or aftermarket?