Number 11 Middle Sight – Typically installed 12 to 14 inches from muzzle. This small, press fit, middle sight is intended for use on ribbed double and single barrel guns. Requires number 47 drill and then taper reaming to specific depth. Start sight with hand pressure and finish with driven hardwood. Bead diameter is approximately .074 inch. Can be secured with adhesive epoxy such as Brownells Acraglas®.