I have a ss5-20 illuminated scope on my 308 and love it, now I need a scope for my ar50. I don't get to shoot it very often so I can't take the scope off the 308 for it. I really like the ss optics so I'm thinking about a fixed power scope for it. I want the highest power I can get with the least mirage. I'll be taking it out to 1,000yds when I can. I live in a hot enviorment so mirage is usually bad here. What do you guys think? Help me decide as I've never used the fixed power models. 12x, 16x, or 20x?