I have a Nikon 1-4X 20mm on my AR. It is a great scope, and I recommend it highly at the $250 - $300 price point.
I recently put a Leupold FX-II ultralight 2.5X fixed power scope on a Marlin 336. I think this would be a good AR scope as well, and it is seriously lightweight. If a person were building a lightwieght AR and and wanted a magnified optic, this 7 oz Leupold would be a good choice.
|