Dumb question:
How much do Glock firing pins sell for on the market? May be worth it to figure that out before you have to jump through 18 hoops to get one "free", ya know?
Just buy it and change it yourself if you can't find an armorer. Trust me, its very easy to change a Firing Pin on a glock.$40 for the FP. Plus minimum labor charge($25). Total OTT $65.
Figure a savings of $40.