I’ve been getting a couple misfires lately with my Kimber Montana and noticed that the firing pin set screw had backed out of the cocking piece and the firing pin spring tension was very light. There’s lots of room to increase the tension but not sure how far to go.
Is there a specific measurement from the bolt shroud to the cocking piece, when the pin is un-cocked, that I should set it to? Or is it measured by weight? Thanks.

Put a touch of purple Loctite on mine and turned it all the way in with an Allen wrench, haven’t thought about it since. There was a thread about this issue awhile back in the Hunting Rifles forum....

I use finger nail polish.



Check firing pin protrusion, it should be about .050”

Here’s a thread on the issue:

https://www.24hourcampfire.com/ubbt...e-firing-pin-on-the-kimber-8400-pictures

Thanks for the reply. I already measured the pin protrusion from the bolt face and it is .055” so no problem there. It looks like just a matter of adjusting the pin spring tension. I have quite a bit of room to increase the tension before the the cocking piece bottoms out on the bolt body in the fired position, but just not sure if I should be increasing it that much. I’m sure there’s a standard for setting that spring tension and I was hoping someone here might know. I’ll add some tension and try some rounds,,,,, trial and error style. Should be able to get a good consistent pin strike without using all the tension adjustment available.

Stacking 2 shorter set screws would not require any goop

Damn, you take all the fun out of what I was going to post. I was going to say it's a common problem. I think Brad uses his pink nail polish to secure that screw... And sure as chit it is pink...

A follow-up:

Took delivery of a 223 Montana from Whittakers a few days ago and just checked the set screw. This one came from the factory bottomed-out/tightened all the way down. Always made the most sense to me.