Large and Small Brass Bead Front Sight Ubert 1873 / 1866, Rossi and Marlin .510
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These sights slide in the standard 3/8" dove tail and lock into place with the allen wrench provided.
Kit includes the .510” Height x 3/8” Dovetail Sight. Interchangeable .130” Bead and .175” Bead and Allen Wrench: