[lavric]

What is this mark..?

What is this mark and different number on right side?
BTW: mine is double action and gas-sealed cylinder. But unfortunately it has home-made firing pin.
Thank You,

 

[lavric]

Gas seal or not..?

If the cylinder of the gun is original it is not a true gas seal cylinder. The cylinder merely moves up to the face of the barrel stub. I have seen only one .22 conversion where there were interlocking surfaces on the face of the cylinder and the barrel face to create a gas seal.
Joe

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Looks, like "M" stamped over "K".
When I "****" hammer, cylinder moves forward and interlocking surfaces same as on others Nagants. Numbers on the face of cylinder not the same, as on frame. I am not really care about gas seal.
This is not very good pictures, but,...