Mosin bolt not staying cocked!

jonyork

jonyork

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Ottawa
Hey guys,

This is a bubba'd mosin I rescued from the pawn shop that I refinished and tuned up.

It's come to my attention that it doesn't always stay cocked when I close the bolt. It seems to survive the bump tests, but not cycling the bolt.

If the gun is flat, it will decock maybe 1 out of 50 times.

45 degrees in the air, it will decock maybe 1 out of 20 times.

90 degrees in the air, it will decock almost all the time, maybe once out of 20 it wont.

I have a feeling it is related to the trigger/sear engagement. Anyone have any previous experiences or know how to fix this?

Thanks!
 
Yes, this is related directly to the sear / bolt stop and sometimes the cocking piece of the bolt itself.

Some Mosin-Nagant rifles will decock at any angle but many will not decock when the rifle is held vertically. The rifle, if assembled correctly (check firing pin protrusion) should still fire 100% of the time, and if it does, you should be fine.

If not, buy a replacement trigger group / cocking piece.
 
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The cocking piece is slipping off the sear. DO NOT load it with live ammo until this is corrected! There are a variety of way to correct this but it's very difficult to diagnose with out seeing it first hand. Do you have anybody who knows mosins in your area?
 
alright it seems like when I took the paint that bubba put on the bolt, I may have polished/lubed the cocking piece too much. A couple of passes of 100 grit sandpaper and shes doing it it seems. Will test extensively some more before loading
 
I would be doing more than the bump test. #### it, and then grab the cocking piece and wiggle it up and down, side to side, and see if you can make it slip off the sear without touching the trigger. Or you could even gently pry up on the cocking piece with a screwdriver. If you can get the striker to fall without touching the trigger, it is unsafe. Also, check the sear to see if it looks like it has been shortened, or if the corner has been rounded off. And the sear spring to see if it is misshapen. And the sear engagement lug on the bottom of the cocking piece should be 90 degrees. It is possible that someone trying to polish it might have screwed up the angle.
 
jonyork said:
alright it seems like when I took the paint that bubba put on the bolt, I may have polished/lubed the cocking piece too much. A couple of passes of 100 grit sandpaper and shes doing it it seems. Will test extensively some more before loading
Click to expand...

Ah, I didn't realize you had done any modifications to the sear or cocking piece.

You should probably replace them.
 
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