butchlambert
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Here you go gat I hope the picture is good enough for you to see the shank OD is 1.040 a regular 98 large ring thread won't even start in this action.
Stan, gat may have chambered a 100 or so of them, but he hasn't seen the Winslow FN. gat, Stan probably chambers more barrels in a year than most volume gunsmiths do in a lifetime.