Hi Strider! There is a little varience in the depth of the concave surfaces, but with out measuring them, it would almost be impossible to decern a .050" difference in the radius... what is different, and causes the random, no two the same type of appearance, is the depth and radius of the external radius on the outside of the knob, and how much this was buffed and polished, to relieve any rough or sharp ridge... it almost appears as if this was the least important spec. on the whole gun! Till...later...GT
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