This sight mounts in the existing factory dovetail with no modifications to the firearm. The aperture is bright and clear to the eye. We supply this sight with a .155" (X Large) peep to accommodate the wide factory front sight of the 1860 Rifle. We made this sight shorter than our standard Barrel Mount Dovetail Sight to fit the tighter space between the barrel dovetail and the receiver. Other than that, and the .155" aperture stock size, the two sights are the same. "I have been shooting this exact sight (as pictured) on my own 1860 Henry Rifle (44-40) and accuracy is amazing! The sight picture is quick to acquire. Just look through the peep and focus on the front sight. Machined from solid 360 brass bar stock this sight looks like it could have been installed during the Civil War. (If Skinner Sights had been present during that era, we would have made sure they were!)" Andy
