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Joined: Mar 2015
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OP
New Member
Joined: Mar 2015
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My 640 KC 22 mag misfires . The firing pin does not strike the rim hard enough . Has anyone dealt with tis problem ?
Last edited by MurrayP; 03/27/24.
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Joined: Jun 2008
Posts: 6,078 Likes: 1
Campfire Tracker
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Campfire Tracker
Joined: Jun 2008
Posts: 6,078 Likes: 1 |
I fixed a litlle cheapie single shot Savage-Springfield a couple weeks ago that was misfiring.
There was so much varnished “gunk” in the channel that the firing pin traveled in (60 year-old oil turned to varnish, and old powder residue) that it wasn’t moving well. Flushed it out with cleaner, then re-oiled.
I’d look at cleaning the thing well (take the bolt out and clean it/soak it), then consider whether the spring is weak or if the firing pin is possibly broken.
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Joined: Aug 2010
Posts: 48,098 Likes: 8
Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2010
Posts: 48,098 Likes: 8 |
My 640 KC 22 mag misfires . The firing pin does not strike the rim hard enough . Has anyone dealt with tis problem ? I totally rebuilt mine. Go to Numrich, and see if they have any firing pins and springs. Wouldn't be a bad idea to replace other springs as well, and check the extractors too. Mine were all worn out. Sounds like your hammer spring and firing pin may be worn out though. If yours needs a firing pin, check to make sure you know which one it requires, before you order. They have different variations. Numrich also has schematics you can buy, and pictures of the different parts. I'd check everything, and replace everything that looks suspect or weak. They are pretty easy to work on, and exceptionally accurate/precise shooters. Good luck with it.. NUMRICH MOSSBERG 640 SERIES RIFLE SCHEMATIC AND PARTS LIST
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: Aug 2010
Posts: 48,098 Likes: 8
Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2010
Posts: 48,098 Likes: 8 |
Keep us posted on what you find out. These are great little rifles.. ![[Linked Image from i.imgur.com]](https://i.imgur.com/lDxS6zs.jpg)
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: Dec 2021
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Campfire Regular
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Campfire Regular
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Campfire Outfitter
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Campfire Outfitter
Joined: Jun 2010
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When I was young I had a Mossberg 340K that would do the same thing. My dad tried to claim the rifle belonged to him and not me so I never bothered trying to fix it
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