I had the opportunity to shoot a friends Sig 556 with Eotech 516 holosight. I really liked it, so I think I want to save up my change and get one. I see they make one specifically compensated for .223 (Eotech 556) out to 600 yds. Not that I plan to shoot much past 100 yds, but I like the idea. Which Eotech would you get for an AR and why? Thanks!