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I have one in 5-20 x50 AO with green dot. Works very well in low light conditions and the green dot is nice and bright, even in darkness. I had it on an M1A. The combo was quite heavy. Good for road hunting and still hunting. You may tire fast if doing lots of hiking. Good scope though.
There are new higher magnification models coming out next week at the Shot Show as Trijicon appears to be going after Nightforce in that area (application/price and quality). Time will tell...Phil.
That depends entirely on the calibre of rifle it is to be mounted to and the users ability. The standard magnification for mil snipers used to a fixed 10.