Shotgun sight installs onto standard barrel ribs; perfect for any of the shooting sports or for upland game. Just remove the front sight bead, and the HIVIZ is held in place by magnetic/snap on installation. Includes one red and one green interchangeable fiber optic light pipe, plus a light pipe changing key.Notes:Interchangeable LitePipesComes with five different thread size studs to fit most common shotgunsInstalls on the vent rib using the hole from the front bead (if no hole, will need to drill and tap the rib)