Swiss K31 and the M1 Garand Throat erosion gage.

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lencac

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Hi Guys:
I've posted a few photos of the "P" series K31 I recently acquired and restored. I took it to the range today for the first time to do some testing and set-up. The results were stunning. Stupid accurate :D During the restoration I noticed somethings that were done to make it this way. The action was shimmed in the stock, it had a trigger job done and it is sweet :cool:
I had the blued metal Cerakoted in graphite black with the exception of the barrel itself. The Hammerli barrel has a very cool plum colored patina to the bluing. My experience with metal that shows this plum color after bluing I believe indicates high nickle content in the steel. I learned this from when I would have nickle steel 1903 bolt bodies blued. They would show the same plum color. So I liked it and preserved that feature by not Cerakoting the barrel itself.
And now here's a little something I just discovered. I have a couple M1 Garands. I also have the throat erosion gage for the M1 Garand. So the thought came to me to see how that gage would work on K31's. It works great. I have several K31's and a couple with what appears to be brand new barrels so I used those as a reference point. With the gage inserted in 2 different K31's with what appears to be new or near new Hammerli barrels the reading was 1.5. Then checking my other 10 more used K31's I came up with reading of from 2 to 4. The 4 being a barrel that has visible throat wear and the rest to a lesser degree.
So if any of you who have K31's and an M1 Garand throat erosion gage I ask if you could check yours and post your results. I'm trying to gather enough samples to make a call on what is a good reference point.
 

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Few more pics
 

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Some more close-ups
 

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Here's a photo of the throat erosion gage in the breech
 

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don't have a wear gauge or even a K31 myself but man that sure is a gorgeous rifle. even if not collector grade.
 
What is the grade after a stock gets sanded and a new coat of Tru-Oil or Tung is applied?
I just steamed the dents out of mine and waxed it.
It shoots well and the K-31 was made with 2 different grades of steel.
 
Swiss Armory beginning bore/acceptance specs.


1/6=7.54 (Breech diameter)
2/6=7.54
3/6=7.53 (Midpoint of the barrel over the length)
4/6=7.53
5/6=7.53
6/6=7.52 (Muzzle Diameter)

And.....................

Bore diameter for the 1889 rifle in mm. ;
7.49 = new.
7.56 = maximum.

For the M-1897 cadet and the 1889/96;
7.48 = new.
7.56 = maximum.

For the 1911 rifle and carbine;
7.54 = new.
7.60 = maximum.
7.64 = rejected.

For the K-31;
7.51 = new.
7.56 = maximum.
7.64 = rejected.
 
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Each gauge is about 10" long and with help of the top part 3 can be screwed together.
This civilian kit comes in a brown/red pouch and I was lucky to buy it very long ago second hand for little money
I noticed a Swiss gun smith recently using a longer set, each gauche being about 30" long and when I asked him about the price of that set he told me that they are around 4-5 hundred Swiss francs or $320-400 .:x



*Courtesy Guisan
 
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