Now i'm using the Trijicon VCOG 1-6x24 scope on my AR10. It's a premium quality scope with aircraft-grade aluminum alloy housing and 4-inch eye relief. Before these Trijicon i also used the Vortex Viper PST Gen II, that one also was good. But this Trijicon seems better than Vortex one. Althoug price is double than Vortex.