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Old March 5, 2009, 02:06 PM   #9
Senior Member
Join Date: August 9, 2007
Location: Oregoncoast
Posts: 1,520
Yeah, that's definitely a stress fracture at the back of that pin. I'll talk to the metallurgist I work with for his suggestion on the best steel to use. Other than that I'd figure 4140 heat treated to RC45. The firing pin on a 1911 is specified as medium high to high carbon steel between 40 and 46 Rockwell. If it doesn't hold up at least we tried.
I have CNC produced 416 stainless triggers to replace the plastic triggers on Colt Mustangs, Mustang Plus II's, MK IV Government .380's and Sig P-238's. Video on installation in Sig; Plus Llama .32 and .380 recoil spring buttons, checkered nicely and blued.
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