.22 bolt action fires when the bolt is closing

Mattyb

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I have an old Mossberg 144LSB that is firing as I close the bolt (generally while turning the bolt handle down), or sometimes after I close the bolt and lightly lift up on the bolt handle. Any guess as to where to start troubleshooting? It has an adjustable trigger, but even adjusted super heavy, it still does the same thing. It's not every time, maybe 6/10 times the bolt is cycled.

Any ideas?

I really want to cut the barrel down, re-mount the front sight, and use it for more precision plinking here at the house, but not if it's going off randomly.
 
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Is it very very clean?

Is the hammer falling when it fires this way?

Sounds like camming the bolt in is crushing the rim and setting it off. Unless the hammer is dropping when you close the bolt it doesn't sound like a trigger problem.
 
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I agree with Jim. Check the firing pin to make sure it is clean and something didn't jam it forward.


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Something is messing with the rim ... can you post pictures of the edges a case or two?

ETA ... Personally I'd leave that rifle as is once you cut it you can't undo it. I have a 44US-d and love shooting it with the peep sights even as heavy as it is. They are not expensive rifle but I think they are worth way more than the price. Mine is as is with the exception of a few pieces needing to be replaced ... Havlin Sales is THE expert on these old Mossbergs and good source for a spare mag especially.
 
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I had my dad's old remington 511 that was acting just like this. as it turns out it had not been cleaned in years, and the dirt and grime combined with gun oil was not allowing the sear to fully engage. Try a good cleaning of the bolt and trigger assembly. Check to see if the sear is worn. Check your springs. Could be a dirty gun OR worn parts.
 
Sounds like the trigger return spring isn't allowing the trigger to engage the sear and therefore the firing pin isn't being held captive by the sear. Through cleaning and if it still does it you may need to replace the trigger return spring. Holler if you do, I may have one that will work...
 
Sell to BloodRunsThicker and he'll get it sorted out. That way you don't have to worry about it. [emoji41]

Mine did the same thing when I got it. An ultra through cleaning and complete disassembly of the bolt fixed it.

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