I have a Colt 1851 .36 made in 1862. One thing different from repros on this original gun is the wedge screw - it has an oversized head that contacts the wedge and acts as a depth set, or check, as Colt intended it to do, so the wedge (key) cannot be pushed in too far. I have not seen an oversized wedge screw on any modern BP revolver (though I added one on my Pietta 1860 .44 Army).
The barrel/frame connection is very tight on the 1851.
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