I currently have a Nikon BuckMaster 6-18x and a Monarch 6.5-20 and both are good scopes. The Monarch I have had close to 20 yrs and recently (last year) sent it back to Nikon to have the Adjustable Objective (AO) calibrated. Full warranty. Think I paid $7 to ship it to Cale-forn-e-i-a. Had it back on my rifle in two weeks. Very smooth. JohnnyK.