Mosin Repair Thread

[kris smith]

Will do bill I'll cal you this weekend

[Vlad 11]

Hey all, I got a sticky situation - specifically, a stuck bolt.

My mosin 91/30's bolt refuses to open when the rifle is not cocked.
The rifle has never been fired since buying it from Big5.

So far what I've tried is:

• Disassembling the bolt and cleaning it again.
• Pouring hot water down the barrel and trying to remove any excess cosmo.
• Further cleaning with a 20 gauge brush with polish cleaning the chamber.

So far, no such luck.
I can only open the bolt when I pull back on the cocking knob while opening the bolt. When it's cocked, the bolt will open/close normally.

At the moment, the only thing I can think of is the spring is bad, and I should just order a new one.

Any thoughts?

Hmm that's a weird one ,,,

The locations the bolt may bind as it ramps up to 'cock on opening' would be

The bolt head lugs in the receiver. The bolt body handle lug on the receiver.

The bolt head or bolt body on the guide connector.

Or the ramp on the bolt body/cocking knob.

Since its operating when the cocking knob relieves pressure on the bolt , the problem might be back there.

The trigger/bolt stop could also be interfering with the bolt

Another unlikely cause may be the firing pin protrusion is too great causing excessive pressure on the bolt head.

Hard one to tell without seeing the bolt firsthand

[kouye]

Hey all, I got a sticky situation - specifically, a stuck bolt.

My mosin 91/30's bolt refuses to open when the rifle is not cocked.
The rifle has never been fired since buying it from Big5.

So far what I've tried is:

• Disassembling the bolt and cleaning it again.
• Pouring hot water down the barrel and trying to remove any excess cosmo.
• Further cleaning with a 20 gauge brush with polish cleaning the chamber.

So far, no such luck.
I can only open the bolt when I pull back on the cocking knob while opening the bolt. When it's cocked, the bolt will open/close normally.

At the moment, the only thing I can think of is the spring is bad, and I should just order a new one.

Any thoughts?

I had the opposite issues, bolt would not close even with an empty chamber. In my case it was a slightly bent extractor.

The way I found the problem was to swap bolt parts with another MN, until I could identify which part of the bolt (or if it was the receiver) was causing the issue. Anyone near you with an MN?

[banpreso]

just put a mosin in jail in big 5. it's my first mosin and my first C&R. the gun is covered with oil and lube. what do i need to do to clean it up before it's ready to shoot? just wipe it down? do i need to lube certain parts before i take it out to shoot?

thanks

[kouye]

just put a mosin in jail in big 5. it's my first mosin and my first C&R. the gun is covered with oil and lube. what do i need to do to clean it up before it's ready to shoot? just wipe it down? do i need to lube certain parts before i take it out to shoot?

thanks

Search for "cosmoline" in this forum and you will find many answers. Have fun!

[banpreso]

Search for "cosmoline" in this forum and you will find many answers. Have fun!

ahh thanks! didn't even know what was was called, haha.

sooo looking forward to shoot it!

[Kristic]

I'll try to post pictures tomorrow, hopefully I can get better lighting.

Anyone in the San Francisco area have a working mosin that could help me troubleshoot this?

[Josh Smith]

I'll try to post pictures tomorrow, hopefully I can get better lighting.

Anyone in the San Francisco area have a working mosin that could help me troubleshoot this?

Pay special attention at the 5 minute to 11 minute mark.



Pay special attention from 1:30 on.

I hope this helps!

Regards,

[Kristic]

Well, I took the bolt apart once more, and this time lubed it up generously. Previously, I did not use any lubricant on it, but after watching your videos I put lube on the connecting rod, as well as all over the cocking knob (where it rubs/slides against the bolt body as it opens), and the bolt works just fine!

I took a picture of the cocking knob piece, as upon further inspection I saw there was a spot that appeared to be a metal bur. I think it's from rigorously smacking the bolt open when it was stuck.

I hope the picture comes out ok, as I only have my camera phone available.

[VintageDUG]

Took my troubled Mosin over to Bill's this morning. He was set up and ready to work when I arrived. The first problem he noticed was it was a filthy mess inside. The second problem was a broken spring. He helped me clean it up after totally disassembling it and did a lot of polishing on the bolt. He showed me places to polish on the trigger and sear as well. He then took parts off of his personal gun to repair mine. It now looks like this is my best Mosin so far.

I appreciate him taking the time to teach me and guide me through this. He is a great guy all around.

[kris smith]

Bill Is a great guy I'm glad to know him and I'm glad he fixed your rifle

[Flyin Brian]

I'll try to post pictures tomorrow, hopefully I can get better lighting.

Anyone in the San Francisco area have a working mosin that could help me troubleshoot this?

I am planning to be at the USI rifle range in Concord on Sunday morning with another Calgunner. I've taken a Mosin apart a few times and I could help you figure out what the problem is

[Kristic]

I am planning to be at the USI rifle range in Concord on Sunday morning with another Calgunner. I've taken a Mosin apart a few times and I could help you figure out what the problem is

Hmm, I might consider it.
I live in SF, but I drive up to Richmond Rod & Gun on Sundays.
Concord is a bit out of the way, but if I have the time I'll definitely go. I'll hit you up via private message if I can make it.

[marksmandowntown]

OK, so I've got a problem with my rear site mount on a 1936 Tula 91/30. I've pulled the pins, the spring and the rest of it, but I can't get the site mount bracket off no matter what I do to it.

I suspect that either: 1) I have not totally drilled out the cut-off screw up on top (I wanted to be careful to not go too deep and how much can 1/4 of a tiny little screw hold anyway?), or 2) There's some solder buried under there that I failed to heat up enough.

http://i93.photobucket.com/albums/l67/aulslime/sitemount.jpg

I'm looking for advice and ideas. Am I not applying my torch properly? Have I missed a second screw?

As good as cutting the damn thing off would feel, I don't want to not be able to put it back like it was.

[Josh Smith]

Cutting it would take you right into the barrel.

It's filled with solder, as you said, or most likely is. You really need to heat it and hit it forward HARD. We're talking wind-up and let swing! They are on there tightly.

Josh