The most common K22 styles I have seen are.
Pre war Patridge with gold or SS insert (left),
Early Post war barrels had a narrow tall rib with a matching narrow patridge site base (middle).
Heavy Masterpieces ramp bases were slightly wider to match the barrel (right).
The 17-5 and early 17-6 had slightly heavier barrels with wide rib and longer ramp base,
Most I have seen have Baughman ramps.
The 17-6 and 617 full underlug has a lower Patridge of slightly different shape.
Current style Model 17 and Model18 .