That is the seam where the side plate fits the frame.
Here is a link to a exploded view of the revolver:
Smith & Wesson Model 686-1 Revolver Parts | Gun Parts Corp.
See how the side plate part 32, fits the frame part 25.
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never get out of the boat
Last edited by serger; 05-23-2020 at 04:22 PM.
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