John, that would be the "bead" in the frame sculpting, that was small but somewhat time-consuming, which met with the lower "bead" of the barrel flats when the action was closed.
One has the bead while the other doesn't.
.
__________________
"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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