This sight comes in two thread sizes. 8-40 for Marlin and Henry Lever Actions. 6-48 for almost all other firearms that are drilled and tapped for scope mounting. The Low Profile 8-40 Sight fits most Marlin and Henry rifles and usually works with the factory front sight. Elevation adjustment is made by turning the stem and locking it in place with the knurled lock nut. It has no windage adjustment other than that offered by drifting the front sight. It mounts in any of the drilled and tapped holes on top of the receiver. This sight comes standard with a .096" aperture. Accepts any of our other 5 sizes of apertures. The Lo-Pro 6-48 is a very versatile sight that fits almost any firearm with a 6-48 mounting hole. (Common on almost all guns) Our LO-Pro also works great on rifles like the Ruger 10/22 and shotguns with drilled and tapped receivers. Features a rubber O-ring under the locking ring to prevent damage to the receiver when the locking ring is secured. This sight measures .275" from the top of the receiver to the center of the aperture at the lowest setting.
