Made to replace and improve upon the factory sights of the Marlin 336, the Truglo Rifle/Shotgun Sight - Marlin 336 features full adjustment capability for elevation and windage. This sight has been CNC machined, and it is not intended for carbine barrels. It is easy to install, and you can do it yourself in only a matter of minutes. It is made tough to handle the rigors of recoil, and it is the ideal sight for hunters in the deep woods in low-light conditions. Replaces existing factory sights Full windage and elevation adjustment CNC-machined Not for carbine barrelsv Front diameter is .060" Rear diameter is .035"