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Old 07-30-2009, 03:31 AM   #1
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Default Mosin-Nagant 91/30 question

I took my 91/30 out for the first time to shoot it. I got 4 out of 5 rounds downrange and the casing stuck. I was unable to cycle the bolt until I got home with a little friendly persuasion from a rubber mallet to the bolt. When I got the bolt open the casing was stuck. I was able to get it out bit don't know what caused this. Did I not clean the barrel out enough?

Any thoughts?



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Old 07-30-2009, 03:46 AM   #2
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Al Milsurp weapons are coated with antirust grease ( I can't remember the proper name). Have you cleaned all that junk out of the chamber? It takes a lot of time and elbow grease to get it all out. I had to do the same with mine.



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Old 07-30-2009, 04:15 AM   #3
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It is called Cosmoline and that is what I think might be the problem. I fired the rounds fairly close together and heated up the barrel. I was wondering if there may have been more left on it and it gummed things up when heated.

What did you use along with the elbow grease to clean it? Is there anything specific that will cut this stuff?

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Old 07-30-2009, 04:17 AM   #4
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The most likely culprit is a dirty chamber. I would clean the chamber with a chamber brush, and get as much of the cosmoline out as possible. Then go to the range and fire several rounds, and clean it again while it is hot. Use either gun solvent, or brake cleaner. Keep the brake cleaner off of the stock. Then oil the chamber afterwards. Repeat this until it does not stick anymore. Another possible cause could be the ammunition. Some of the ammunition available is covered with varnish. The first few rounds of this ammo will generally eject smooth. As the chamber heats up, the varnish heats up, and can bond to the chamber, causing the bolt to stick. The best way to prevent this is to try and stay away from the varnished rounds.

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Old 07-30-2009, 04:37 AM   #5
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Quote:
Originally Posted by NitroxAZ View Post
It is called Cosmoline and that is what I think might be the problem. I fired the rounds fairly close together and heated up the barrel. I was wondering if there may have been more left on it and it gummed things up when heated.

What did you use along with the elbow grease to clean it? Is there anything specific that will cut this stuff?
Thanks for refreshing my memory!!

I separated the action from the stock and used some ol carb cleaner and a chamber brush. There was so much crap in the chamber, that I resorted to attach the brush to a variable speed drill to help get rid of it.
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Old 07-30-2009, 06:38 AM   #6
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The problem, most likely, is the lacquer that is used to coat the steel cartidge cases the ComBloc used. As mentioned above, after several rounds, especially without a cooling period between rounds, hard bolt operation is very common. After your extensive cleaning of the chamber, try the same ammo. If you at least get more rounds off before the problem returns, it is the lacquer.

Tom

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Old 07-30-2009, 06:09 PM   #7
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Remember the rifle was designed in Russia, for Russia and the winters get COLD. The chances of heating one up badly in the battle of Stalingrad are slim to none. Good solvent and elbow grease should solve your problem.

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Old 07-30-2009, 08:12 PM   #8
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What solvent is the best for this?

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Old 07-31-2009, 11:42 PM   #9
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Had the same thing happen,I used Rem bore cleaner and let it soak 20 min. or so and put a 20 ga. bore brush on a section of cleaning rod and put it in the cordless drill.
run it in and out from the breech medium to medium slow.
I haven't had a problem since.

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Old 08-01-2009, 12:36 AM   #10
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Quote:
Originally Posted by NitroxAZ View Post
It is called Cosmoline and that is what I think might be the problem. I fired the rounds fairly close together and heated up the barrel. I was wondering if there may have been more left on it and it gummed things up when heated.

What did you use along with the elbow grease to clean it? Is there anything specific that will cut this stuff?
I took a length of pvc pipe, cut it in half lengthwise like a trough. Filled it with some stuff from H.D. called T.S.P. Substitute and let it sit for 30 min. then scrubbed with various brushes, sprayed everything down with Gun Scrubber, let it sit, scrub it again, use a water hose with nozzle to rinse it and then spray it with some lube. Remember, no matter how clean it looks and how thoroughly you think you scrubbed it, As soon as you heat that gun up, Cosmoline will ooze out of every orifice and crack of that gun! Just Clean it again!!


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