Here's the story, after a shooting session today, I decided for the first time to detail strip my Colt Commander. I bought this gun new in 2007, and it has about 1500 rounds through it. I never gave a series 80 pistol much thought - until I tried to get the firing pin out of the slide - what a pain in the ass! After some trial and error, I got the slide in pieces.

The rest of the gun stripped down fine. Although I am rusty in putting it all back together. I tried to re-assemble the slide, but I could not get the firing pin stop to snap over the rear of the firing pin. After a few choice words and examination of the firing pin, I noticed that the hammer had peened the rear of the firing pin. If you look at my photo you can see it (sorry - this site is not user friendly for uploading photos). I'm wondering if this is common, and any recommendations to what brand of part I should replace it with?

Thanks for the help.

Armory drawing call for hardening with oil quenching and tempering.

Hardness reading on 0.2 diameter should leave 0.01 inch deep mark.

No hardness table, weight, drop height handy.
Hammer routinely mushrooms the head after heavy use.
Chuck it up and use a fine file to remove the mushrooming if it starts to catch on the firing pin stop.