I've got a Viper 6.5-20x 44mm on an AR varmint rig.
It's optically superior to the Buckmaster 4.5-14x 40mm mildot that I have on my .308 (better resolution, less tunnel vision). I had initially planned to get a Nikon Monarch 5-20x 44mm model, but after checking them out at several stores, I actually found that I didn't even like them as much as my Buckmaster. The optics seemed hazy,and almost fogged/greyed out at high magnification when the exit pupil shrank. My Viper does reduce available light when it's cranked up,but it doesn't have that effect that the Monarch did. I'll note that I only tested 5-20x Monarchs. I've not seen this in the lower power Monarchs I've looked through, nor have I had a chance to directly compare a Monarch and Viper side by side for resolution.
I will say that I really,really like the Viper turrets. However performance wise, the Monarch and Buckmaster turrets are just as nice,and my Buckmaster at least,tracks very well.
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