CM-2 bolt - Bolt disassembly photos & Ejection Troubleshooting - RimfireCentral.com Forums

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  #1  
Old 07-29-2008, 09:18 AM
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CM-2 bolt



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I just picked up my new CM-2 yesterday. I brought it home and cleaned the barrel and was going to disassemble the bolt for cleaning but I can't get it apart. I put a wrench on it but it still won't let go. The instructions say to unscrew the head of it but I am not having any luck. Does anyone have some advise for me?

Last edited by aom22; 07-30-2008 at 02:51 PM. Reason: Restore Original Title
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Old 07-29-2008, 07:55 PM
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Don't put a wrench on it! rotate the bolt handle while holdingthe front of the bolt. It's only difficult if it is oily or greasy. It isn't difficult if you hold the front barrelwith a ragor paper towel. When taking it apart lay the parts out in the order they were removed. Putting the firing pin back in is simpler than I first thought. Iwas confused by the grooves on the inside ofthe rear barrel of the bolt. I kept trying to twist the firing pin into the rear. Just slide it in and let the lug catch in the v notch ofthe rear barrel.
When I first got my CM-2 I loadedthe bolt up with JB bore paste and cycled it for an hour both in and out of the receiver. My bolt feels very smooth when loading and unloading.
When I get home I'll pull my bolt out and post a better reply on the bolt.
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Old 07-29-2008, 08:01 PM
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i have a newer one

i grab the bolt towards the front and turn the bolt handle down
like you would if you had it in the gun and were closing the bolt
and at that point it's uncocked, at that point mine just slides apart.
once you put it back together you'll need to recock it, i've used visegrips
with a rag around the bolt to keep from scratching it while you push the
handle back up. the parts are pretty rough looking like somebody in the
no. 2 tractor barn in moscow just took a file to a piece of metal and made
'er fit. you might have to press in a little on the back of the bolt when you
start to turn the handle it's kind of catchy. i hope this is what you wanted
and does the job. good luck.
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Old 07-29-2008, 08:07 PM
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I just took some pics of the process on my older CM-2 bolt. I will edit my post shortly to show how to disassemble.

Edit:
Okay, starting with your bolt cocked, turn front half of bolt to uncock the bolt


Turn the front half slightly further and it should pop out a little like so


Slide the front half off the bolt


See the little groove behind the striker assembly? You're going to push the striker down and back into that groove, and it will pop out...




basic disassembly is complete. AFAIK any further requires pins to be pushed out, which I have yet to do.


Hope that clears it up a bit, a VERY simple disassembly!

Last edited by mr_ouija; 07-29-2008 at 08:15 PM.
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Old 07-29-2008, 08:23 PM
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Good job Mr. O
My currant model is the same.
I also did the same to mine as Charlotte with the JB bore paste
to the inside of the bolt then I worked the bolt up & down.



Swiss

Last edited by midwest swiss; 07-29-2008 at 11:48 PM.
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  #6  
Old 07-29-2008, 11:43 PM
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Mr Ouija, you did a nice job on that photo spread. Something else I do with my bolt....I lube it with STP oil treatment. The thick stuff. You can't wipe it off.
I figured that since the manual suggests using gasoline as a bore solvent I might as well keep that idea close while lubing the bolt.
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Old 07-29-2008, 11:47 PM
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I've got some flitz I could put in mine, think it'd be gritty enough to do the same? The cocking is a little gritty at times. I thought about polishing it up, but just haven't yet. I use Rig Grease on my bolts.

Btw, all I did to my bolt internally, was clean off the greasey lube and sand the corrosion off the end of the striker that sticks out of the bolt. Looks pretty good I think!
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Old 07-30-2008, 12:03 AM
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Charlotte, I'm guessing that Russians are able to get gasoline much more readily than they can bore cleaner.... especially in smaller cities or rural areas. I think I'll continue to use Hoppe's #9.
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Old 07-30-2008, 09:13 AM
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Mr. Ouigi, Thanks for the photos. It made it a lot easier to understand than my owners manual. It came apart very easy but I had to work to reassemble it. I had to keep referring to your pictures. Now I have to get it to eject. It only ejects about 1/4 of the time. Thanks a lot.
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Old 07-30-2008, 09:56 AM
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No problem

I found that if I don't pull the bolt all the way back and pretty rapidly, I've had a few ammo types give me fits with ejection, but most eject easily.
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Old 07-30-2008, 09:57 AM
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Here is a picture of my CM-2, follow the green arrow that is
where the spent case hits to eject it. Your may have the corner worn
off.

Good Lord look at the massive extractors

Swiss

Last edited by midwest swiss; 07-30-2008 at 10:50 AM.
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Old 07-30-2008, 10:42 AM
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Quote:
Originally Posted by mr_ouija View Post
No problem

I found that if I don't pull the bolt all the way back and pretty rapidly, I've had a few ammo types give me fits with ejection, but most eject easily.
Same here. A quick movement of the bolt and the case flies out. It's rare, even with the mount adapter over the loading/ejection port, for a case to fail to eject.

I agree on the pictures you posted; good job!
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  #13  
Old 07-30-2008, 11:37 AM
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Thanks

I did have some of the Russian Junior stuff barely eject and when it did it came back at me. I even had a few eject right back into the receiver.
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Old 07-30-2008, 12:01 PM
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I even had a few eject right back into the receiver.

Mine does this sometimes also.
Now my BB sends them old cases a flying.
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Old 07-30-2008, 02:38 PM
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Great information

Quote:
Originally Posted by mr_ouija View Post
I just took some pics of the process on my older CM-2 bolt. I will edit my post shortly to show how to disassemble.

Hope that clears it up a bit, a VERY simple disassembly!
Quote:
Originally Posted by midwest swiss View Post
Here is a picture of my CM-2, follow the green arrow that is
where the spent case hits to eject it. Your may have the corner worn
off.
mr_ouija and midwest swiss,
Good pictures ... excellent information.

You gentlemen put some time and effort into your posts.
It certainly shows and is appreciated.

Participation such as yours is what makes
our forum a great source of informaton.
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you must know what-to-do, and ... then ... do-your-best.
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Last edited by aom22; 07-30-2008 at 02:46 PM. Reason: Add Text
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