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  #1  
Old 03-18-2023, 12:39 AM
hemiallen hemiallen is offline
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Default Cooper Model 21 bolt -firing pin help- replacement?

I have a very nice LH model 21 in 17 Mk1V that came with factory ammo, and I have some 17 FB reloads that chamber and shoot very well.

To cut to the chase, my misfiring model 21 has 0.047" stickout of the firing pin, and my RH 20 Vartarg has 0.072" stickout. The Factory ammo has a 50% discharge rate so far, shallow dents that look like a chambered round from an AR that you removed vs firing it. The last round chambered but not fired

I pulled the bolt apart and noticed the side of the pin is very black, so I am guessing it might be shorter than when it left the factory. I don't want to swap pins or take down my Vartarg as I am hoping to stretch both of their legs soon, so I would love to get the 17 in working order for the trip with it's correct handed sister M21. The left handed Grandson isn't as shooting of a nut as Grandpa, so he'll get reloads for future range trips once she's back on her feet 100%.

With the only option a lesson on how the back bolt screw might be adjustable, I suspect a call to Cooper's new owner might be my only salvation for skippy flight school for this nice Cooper, and the optional second choice is a Remington 17 FB.

It shoots good, but hey 2 Coopers beats a handful of Remington 700's even with Jewel triggers.....LOL

Thanks for any help

Allen
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  #2  
Old 03-18-2023, 03:02 AM
Gabe221 Gabe221 is offline
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My guess is the spring took set over 30 years of being cocked in the rifle…
I just got done replacing a spring in a M21 , that used to be chambered in 17MK4
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Old 03-18-2023, 04:28 AM
hemiallen hemiallen is offline
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Thanks Gabe

Where did you buy the spring from?

Allen
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  #4  
Old 03-18-2023, 02:13 PM
Gabe221 Gabe221 is offline
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Got mine from Cooper .

I order extra springs for all my rifles, and take out the pin when not in use, or store them in the fired position
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  #5  
Old 03-18-2023, 04:37 PM
Rick in Oregon Rick in Oregon is offline
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Allen, I'll not be of much help on that M21, but a little note on storing bolt guns in the safe may be helpful.

Every time I clean any of my bolt guns and it's ready to go in the safe, I lift the bolt handle up as if to open the action, then press the trigger while slowly letting the bolt handle down, thereby releasing all spring pressure on the mainspring without dry firing the rifle.

Been doing this drill now for over 40 years, never had a mainspring fail or bind up in any way.

Hope you get all your rat rifles ready for the upcoming assault.....Skippy is out 'n about I'm told as of this week. Tick-tock......
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Rick in Oregon - The East Side, where common sense still prevails.
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  #6  
Old 03-18-2023, 04:54 PM
flyrod flyrod is offline
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If your 21 is like my 38 then the firing protrusion may be adjustable.

I'd also suggest taking it apart and cleaning it out completely. It may have brass shavings, carbon, dirt, grease, preservative sludge, etc. interfering with the pin. With the spring off, make sure the pin moves smoothly/freely. Then re-assemble with light oil on the pin, not grease or thick oil.

I once helped a friend with a rifle that would mysteriously misfire when cold, even with warm ammo from his pocket. The problem was thick grease on the pin that would get thicker when cold.

You could also check headspace with the ammo. How much slop does a loaded round have to "get away" from the pin? "Factory" ammo might be pretty loose in there.

Last edited by flyrod; 03-18-2023 at 04:58 PM.
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