The 4-16x42 M-308 riflescopes are a perfectly suited to maximize both the short-range power and the long-range accuracy offered by the AR-style .308 rifle. These scopes come complete with side-focus parallax adjustments, Zero- Reset tactical turrets, and a one-piece Picatinny mount with built-in 20 MOA elevation. Weight is 19 oz. Length is 13.5". 1" O.D. tube.
Sinclair, Issue:3A, Page:184