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finnish 1942 M39 sako

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Re: finnish 1942 M39 sako

Postby DevilDog » Wed May 08, 2013 9:11 pm

Do you think removing the barrel and case hardening the receiver would help?

Has anyone tried to case harden these, or is the steel not apt for that?
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Re: finnish 1942 M39 sako

Postby Shepard » Thu May 09, 2013 4:43 am

DevilDog wrote:Do you think removing the barrel and case hardening the receiver would help?

Has anyone tried to case harden these, or is the steel not apt for that?


If you have a heat treat facility near by I would seek there help. When you heat steel -- depending on how hot you heat it -- burns the carbon out of the steel softening it. Not knowing how hot the receiver got --- I would seek professional help to try to save it. Case hardening is as it says. It is only a hard skin over softer metal. I wouldn't trust that to hold the receiver together as it's only say maybe .015 thick. On a gun case hardening helps to prevent cosmetic damage like nicks and scratches. It needs deep heat treating under a gas cover like carbon dioxide to up the carbon content.
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Re: finnish 1942 M39 sako

Postby farmerboy78 » Thu May 09, 2013 2:27 pm

I center punched my marks and wrapped a soaking wet towel around each side of the mark and spot heated til began to be orangish not red, then drilled and tapped. Just a spot about the size of a bic pen
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Re: finnish 1942 M39 sako

Postby Marauder 1 » Fri May 10, 2013 11:32 pm

Understand that heat spreads and while you had towels around the outside of the receiver in order for that area to get as hot as it did means the entire area had to get that hot.

I've been wanting to do a case hardened Mosin Receiver but I can't find anyone who wants to do it. Most of them are concerned about warping the receiver. Couldn't you use a Rockwell C test? That could show the difference between the heated area and non heated via the depth of the indentation?

Man I don't know, I wouldn't fire it until I had it looked at by someone who is an expert and let them figure it out. Remember this is by your face, if it fails it will be ugly. I know this isn't what you want to hear but it's the safe thing to do and we want you to stay in one piece.

Heck if the barrels good you could always change the receiver.

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Re: finnish 1942 M39 sako

Postby farmerboy78 » Mon May 13, 2013 2:01 pm

Well, talked to my local smith and done some reading on the net... Seems everything is going to be ok with the receiver... Smith said a lot of mausers have to be heated to be drilled and tapped... I am pretty sure rsi website shows that k31 receivers have to be done in this fashion... Will take you guys advice and shot with a string for a few shots before I shoulder it...
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Re: finnish 1942 M39 sako

Postby biggorillagunworks » Mon May 13, 2013 3:26 pm

Grimstod wrote:Hmm strange. Well it is a Finn receiver. They must use good steel.


The Finns never made a receiver- every Finn Mosin-Nagant has a Russian or Soviet origin receiver. They re-worked them, but never manufactured them.

I, too, would never put a torch to the receiver there. Too much risk of destroying the temper. Never had an issue with Mosins, but I'l tell ya that the Swiss K-31...THAT has some serious case hardening.

Ditto what Shepard said on the taps...SLOW...with a lot of oil. Visually check the tap to see if any cutting flutes have chipped off. If it gets dull and more difficult to cut, break out a new one. Snapping off a tap for a #6 flush is a real pain in the azz. Forget about the "Hansons" from Home Depot...hell, I even got crap ones from Brownell's- of all places! I prefer to start with a taper tap (instead of a plug), and finish with the bottoming tap on blind holes.

Try here:
http://www.mscdirect.com/

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Re: finnish 1942 M39 sako

Postby farmerboy78 » Mon May 13, 2013 3:57 pm

Well I got my rsi scope mount installed today and I have gotten my tracking number for my bluegrass stock...hope to have it shootable soon... Interesting tidbit, the same bits that wouldn't drill for the two front screws without annealing, drilled the rear screw with no problem or annealing... Even tapped easy...
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Re: finnish 1942 M39 sako

Postby farmerboy78 » Wed May 15, 2013 6:06 am

well here she is, near complete... im going to have it refinished and threaded for my suppressor in the near future... she started as a 1942 sako, installed RSI hex scope mount and bolt body, installed a timney set at 2lbs, removed rear sight and cut and recrown the barrel at 19 7/8", installed my bluegrass full tactical package stock, and have a swfa ss 10x42 sitting on top... hope to have some loads worked up soon!!! :mrgreen:

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Re: finnish 1942 M39 sako

Postby Shepard » Wed May 15, 2013 6:52 am

I like the scope because of the small diameter. Easier to fit in a case and the FOV seems smaller. I have the SWFA 16x42 SS model and I love it. More of a straight line than my 50 mm scopes. Nice looking build. Are you planning on re-barreling the rifle?
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Re: finnish 1942 M39 sako

Postby 0933 » Wed May 15, 2013 7:58 am

Very cool! 8-)

I hope you don't have any problems with the front receiver ring, and I'm definitely looking forward to a range report!!

You'll be very pleased with that SWFA SS. I run a few on my rifles, and the range of adjustment is nice, but I've NEVER had a problem with them tracking or returning to zero.

Nice build farmerboy!! :clap: :clap: :clap: :clap: :clap: :clap:
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