Russ, I'm still struggling with terminology here. Does "straight walled barrel" in this case mean "cylindrical barrel," or are the straight sides still tapered slightly? I can't tell from the photos here and elsewhere.

If you could mike the barrel diameter on your gun both at the muzzle and at the point where it abuts the frame, that would help a lot.

I have two narrow-rib K-22s from 1947 and 1948, and a wide rib K-22 from late 1953. The barrel of the wide-rib gun still has a bell-shaped flare at the frame, but the barrel walls at the muzzle look to be about the same thickness as in your muzzle photo. I'm wondering if the straight-wall barrels you are discussing are still tapered barrels, but with a straight line from one end to the other instead of the bell-shaped flare.

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David Wilson