Knights Armament USMC 600m Folding Micro Rear Sight - New Old Stock in package. The item "Knights Armament USMC 600m Folding Micro Rear Sight New Old Stock" is in sale since Monday, October 11, 2021. This item is in the category "Sporting Goods\Hunting\Gun Parts\Rifle Parts". The seller is "ilikebmxbikes" and is located in Novato, California. This item can be shipped to United States.