This document provides instructions for servicing a Nikon riflescope in the event of an issue. It also provides specifications and operating instructions for the Nikon OMEGA Muzzleloading Riflescope models 3-9x40 and 1.65-5x36. The document explains how to mount, focus, and adjust the reticle of the riflescopes. It also provides maintenance instructions and cautions the user not to look through the scope at the sun due to risk of eye damage.