My pistol is 9mm and the below information is for a 9mm Springfield.
I just tried to swap the Ti FP for a Ed Brown Springfield steel speced firing pin.
The Ed Brown is .072 diameter behind the end and will not fit my Garrison without turning it down a touch. My Factory Springfield FP is .062 in diameter. so a bit of work with a drill and emory paper or equivalent to get that exact fit.
Measure BEFORE you order. The Ti FP and weak factory FP spring gave me lite strikes usually 3 out of 9 or 10 rounds. I checked and all my primers are seated correctly. There was a bit of black grease in the FP channel as well I cleaned out. I replaced the stock FP spring with a Wolff xtra power FP spring and my pistol is firing all my 9mm loads now.
Good luck with this, I really like my Garrison blued 9mm and am putting in a Kart 38 Super barrel etc in this one. I also replaced the recoil spring which is 9# stock with a 12# Wolff recoil spring and it is functioning better now.
Firing pins are 10 to 12 dollars stateside for either 9mm or 45acp Springfield should replace this under warrenty by just sending you a new one. depending on where you are