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11-22-2009, 02:52 AM
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#1 | | Registered User
Join Date: Nov 2009
Posts: 1
|  mosin nagant gas vent holes
Hello,
did somebody consider drilling gas vent holes to MN chamber and/or bolt?
if yes could you provide some detail?
I am not for sporterizing/modify old military rifles, and this is the only mod I would consider for my MN44 carbine.
Thank you for your feedback,
Pier
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11-22-2009, 06:08 AM
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#2 | | Senior Member
Join Date: Jul 2009 Location: East Coast, Australia
Posts: 265
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Never heard of this done. My M44 works fine without it.
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11-22-2009, 08:09 AM
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#3 | | Senior Member
Join Date: Jun 2009
Posts: 707
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Welcome to G&G!
Drilling gas vent holes in bolt/chamber??????
WHY??????
On the MNs there is only one gas vent hole needed... That is the one at the end of the barrel.
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11-22-2009, 08:39 AM
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#4 | | They wonder why I drink..
Join Date: Dec 2007 Location: South east Wisconsin
Posts: 7,681
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Mosin bolts are very strong. I would not worry about needing extra safety. JMHO.
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11-22-2009, 08:47 AM
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#5 | | Senior Member
Join Date: Aug 2008 Location: Central Iowa
Posts: 577
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This is a great question really.
When smokeless powder repeaters became popular in the 1890s, primer and case failures were common. Handling of the escaping gases usually involved drilling a hole in the side of the reciever ring to vent the gases to the side of the rifle.
For whatever reason, this was never done on the Mosin. That's all the more reason to use glasses when shooting as escaping gasses are directed towards the shooter's face.
I suppose a vent hole on the right side of the reciever at the extractor slot would be the most effective. I'm NOT making a recommendation here though...
Edit- The Enfield, '98 Mauser and '03 Springfield all have vent holes.
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Last edited by Ken in Iowa; 11-22-2009 at 09:01 AM.
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11-22-2009, 09:43 AM
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#6 | | Senior Member
Join Date: Nov 2008 Location: Northeaster Lower Michigan
Posts: 563
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Without vent holes, the only place for gases and metal (in the rare case of head separation or full case splitting or something similar) to go is straight through the ejector groove and upper locking groove raceway, toward the shooters head or face.
Like this: http://www.gunandgame.com/forums/mos...range-day.html (Range day)
"next to last shot out the mosin, i felt a breeze rush past my face and smoke rolled out of the reciever. I picked up the brass and this is what i saw
Attached Thumbnails"
I suppose a gas vent hole drilled in the upper locking lug raceway, near the receiver, would mitigate that danger to some degree. Doing this would not give any reason to be stupid when handloading.
ALWAYS wear eye protectioin when shooting.
tom
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11-22-2009, 10:47 AM
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#7 | | Senior Member
Join Date: Nov 2008 Location: Ottawa Kansas
Posts: 566
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Hey, i think i know who that happened to 
Glasses are always a good idea when shooting for this reason.
really, it was a little breezy yesterday and had it not been for the smoke, i might have not even noticed it
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11-22-2009, 11:48 AM
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#8 | | Senior Member
Join Date: Jan 2008 Location: I don't know where I am, but I know where you are.
Posts: 746
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Don't listen to Tex, he still closes his eyes when he pulls the trigger.
LOL
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11-22-2009, 12:48 PM
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#9 | | Senior Member
Join Date: Jun 2009
Posts: 707
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If the gasses are "leaking" out of the chamber... then your bolt and chamber don't fit... sounds like miss matched numbers...
Check your head space! The bolt and chamber, if properly fit, will not allow gasses to escape...
If they do it is an unsafe weapon and should be banned to the closet...
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11-22-2009, 01:06 PM
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#10 | | Senior Member
Join Date: Mar 2002 Location: Texas
Posts: 1,941
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What the !!!! If gasses are escaping the ammo is usually the culprit. Old brass splits. The shoddy manufacturing found in eastern block client state arms manufacturing are abundantly appearant in some mosin ammunition. Dont apply American standards of safety to their ammunition. If it looks bad THROW IT OUT,... the way to avoid most problems is to LOOK at the ammunition first BEFORE shooting it in your gun.....
Some times even when it looks ok it is not, so wear safety glasses. All this is normal operating procedures for Mosin shooters. If you cant feel safe under these conditions then DO NOT SHOOT YOUR MOSIN NAGANT.... Stay at home watch lots of TV and eat sugary foods.
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Submitted with respect to all
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11-22-2009, 01:45 PM
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#11 | | Senior Member
Join Date: Oct 2006 Location: Montgomery, IL.
Posts: 13,229
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Originally Posted by Mosin Shooter  Don't listen to Tex, he still closes his eyes when he pulls the trigger.
LOL | He closes it while he's AIMING it!
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11-22-2009, 02:37 PM
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#12 | | Senior Member
Join Date: Feb 2008 Location: San Bruno, Republic of Kalifornia
Posts: 2,640
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you don't need to drill any holes. just stay away from albanian surplus ammo and always wear eye protection.
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11-22-2009, 03:34 PM
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#13 | | Senior Member
Join Date: Nov 2008 Location: Ottawa Kansas
Posts: 566
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99 Dragon, that's exactly what happened to me, the cartridge split right down the middle. Gas is gonna leak out of the action when that happens no matter what you are shooting. check out my range day post, there's a pic of the brass.
R5CYA, +10000 ......but i still have a couple hundred rounds left
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7.62x54r...the original short magnum
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11-22-2009, 03:37 PM
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#14 | | Senior Member
Join Date: Nov 2008 Location: Ottawa Kansas
Posts: 566
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here's a pic of the brass
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7.62x54r...the original short magnum
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11-22-2009, 03:45 PM
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#15 | | Senior Member
Join Date: Feb 2008 Location: San Bruno, Republic of Kalifornia
Posts: 2,640
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that's just so ugly! do you inspect your milsurp before going to the range?
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11-22-2009, 04:05 PM
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#16 | | Super Moderator
Join Date: Dec 2005 Location: Alaska Wilderness. Unit 13
Posts: 12,445
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The Truth of this matter is that Rimmed Mosin Ammo SEALS on the rim of the case , so if you split a case , all the gasses still go out the front of the barrel.
You would have to split a rim to get pressure in the action and that is highly unlikely due to the thickness at the rear of the cartridge case.
Now , if you pierce a primer , you will get some pressure back thru the bolt head , But, since the firing pin is "sealed" by threading into the cocking piece , the pressure will actually vent towards the bottom of the magazine well from the bolt head slot and several other outlets of the bolt itself with the firing pin acting as a spring loaded valve in case this happens.
SO a hole ,in this case, is not needed in the receiver...
Rich
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11-22-2009, 04:07 PM
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#17 | | Tex's little Brother
Join Date: Nov 2007 Location: Northeastern Ohio
Posts: 5,188
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Originally Posted by Mosin Shooter Don't listen to Tex, he still closes his eyes when he pulls the trigger.LOL | Tee Hee!
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11-22-2009, 04:10 PM
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#18 | | Tex's little Brother
Join Date: Nov 2007 Location: Northeastern Ohio
Posts: 5,188
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When you fire the Mosin there are two types of gass escaping. The kind from the end of the barrel, and the gas with the other stuff from the guy in the next range, followed by "WHAT THE HECK WAS THAT!!!!!!!".
(There is always a lot of gas escaping, but usually from Tex after chili.)
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11-22-2009, 04:24 PM
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#19 | | Senior Member
Join Date: Feb 2008 Location: San Bruno, Republic of Kalifornia
Posts: 2,640
| Quote:
Originally Posted by Mooseman684 The Truth of this matter is that Rimmed Mosin Ammo SEALS on the rim of the case , so if you split a case , all the gasses still go out the front of the barrel.
You would have to split a rim to get pressure in the action and that is highly unlikely due to the thickness at the rear of the cartridge case.
Now , if you pierce a primer , you will get some pressure back thru the bolt head , But, since the firing pin is "sealed" by threading into the cocking piece , the pressure will actually vent towards the bottom of the magazine well from the bolt head slot and several other outlets of the bolt itself with the firing pin acting as a spring loaded valve in case this happens.
SO a hole ,in this case, is not needed in the receiver...
Rich | i can verify the firing pin and spring acting as a valve on pierced primers! my brother was shooting some handloads with the primers not set deep enough and the spring got sacked in no time at all. about four shots was all it took to kill the spring. he was wondering why his safety glasses kept getting spots on them when he shot. some of that gas was coming back in his face. wish i was watching him to see how much was escaping elsewhwere.
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11-22-2009, 04:41 PM
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#20 | | Senior Member
Join Date: Oct 2006 Location: Montgomery, IL.
Posts: 13,229
| Quote:
Originally Posted by LefthandShooter When you fire the Mosin there are two types of gass escaping. The kind from the end of the barrel, and the gas with the other stuff from the guy in the next range, followed by "WHAT THE HECK WAS THAT!!!!!!!".
(There is always a lot of gas escaping, but usually from Tex after chili.) | That weren't gas.....that was him sh***ing his pants! 
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