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Joined: Jan 2007
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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.
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Joined: May 2010
Posts: 7,335
Campfire Tracker
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Campfire Tracker
Joined: May 2010
Posts: 7,335 |
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....
"When the going gets weird, the weird turn pro."
Hunter S. Thompson
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Joined: Oct 2000
Posts: 30,257
Campfire 'Bwana
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Campfire 'Bwana
Joined: Oct 2000
Posts: 30,257 |
I use finger nail polish. ![[Linked Image]](https://i.postimg.cc/BbLRrQdT/Kimber-Bolt-Pin-zps173e40f0.jpg) 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
“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery
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Joined: Jan 2007
Posts: 956
Campfire Regular
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OP
Campfire Regular
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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.
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Joined: Nov 2009
Posts: 399
Campfire Member
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Campfire Member
Joined: Nov 2009
Posts: 399 |
Stacking 2 shorter set screws would not require any goop
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Joined: Aug 2010
Posts: 47,943
Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2010
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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...
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style. You want to see an animal drop right now? Shoot him in the ear hole. BSA MAGA
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Joined: May 2010
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Campfire Tracker
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Campfire Tracker
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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. 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.
"When the going gets weird, the weird turn pro."
Hunter S. Thompson
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