Cooey Model 600 bolt disassembly?

jaguar

jaguar

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south eastern ontario
Hi all.
Can this bolt be disassembled to check for a broken firing pin and/or to replace/freshen the spring. I am getting to many misfires, and yes it is clean, lightly oiled & free moving. Otherwise it looks like Numrich for a new one. The other option considered was to dress down the striking end of the pin a bit.
Thanks for any help
Cheers
Jaguar
 
Misfires are more often than not caused by the ammo. Especially .22LR. Change ammo before worrying about the firing pin. Gunparts doesn't have any Cooey 600 firing pins anyway.
 
I agree sunray that ammo is usually the cause, however I'm at about 5 misfires out of 20 and have tried 4 different brands, 2 premium, 2 cheaper with no improvement ( Win/eley/fed/rem).
Still want to pull down the bolt correctly....
 
A little troubleshooting is in order here

1) Pull the bolt out and allow the striker to go forward. The firing pin should protrude a little less than 1/16". Give the FP a poke with something non-maring and see if it pushes the striker back. If this works then.......

2) Place a fired brass into the chamber and close the bolt. Now push the bolt forward. If it moves and you can see a gap between the shoulder of the bolt handle and where it rests against the cut-out in the receiver then.....

A) there is wear to the bolt shouler or the receiver.......or both.......or
B) the barrel has moved forward
C) the bolt handle has been hit and is bent forward

If it turns out that the problem is wear to the shoulder on the bolt handle or the handle is bent forward and won't bend back, then let me know and I should be able to dig up a replacement bolt for you.

Have fun :D - regards -Gus
 
jaguar said:
Hi all.
Can this bolt be disassembled to check for a broken firing pin and/or to replace/freshen the spring. I am getting to many misfires, and yes it is clean, lightly oiled & free moving. Otherwise it looks like Numrich for a new one. The other option considered was to dress down the striking end of the pin a bit.
Thanks for any help
Cheers
Jaguar
Click to expand...

It can be taken apart. That requires a wrench you must make. There is a slotted nut that needs to be unscrewed. The striking part of the bolt needs to be held back so the wrench can be engaged. It is a real pain.

Misfiring is usually a headspace problem.
 
Thanks guntech (and others). I was suspecting this and have already mic'd it and sketched a wrench to make. Was not sure that it was not a valve collet type arrangement or other.
Now.... "I'm all over it , like a fat kid on a smartie"
Cheers
Jaguar
 
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