While looking for the scope I wanted and comparing the optics of Bushnell, Nikon and Burris, here are my observations. The Burris was not clear and the controls were stuck like "Chuck". I moved the AO finally and got the eye piece to move for focusing, but the lense appeared to have some unknown substance on it. The Nikon Buckmaster was clear but not as brite as the Bush. The AO only starts at 50 yds to Infinity, The Bushnell was clear, controls worked smooth and the AO starts at 10 yds. This may not be important to CF guns but to a RF it is a must. Up close and out of focus, turn the AO and clears up. All these scopes were brand new in the box unwrapped. FWIW this was my recent experience.
Randy
Randy