Magpul MBUS 2 Rear Back-Up Sight Dark Earth

The Magpul MBUS 2 Rear Back-Up Sight Dark Earth is made of the lightweight but certainly very strong polymer.

This backup sight fits every picatinny and weaver rail and is windage adjustable. A button on the side allows the sight to be flipped up via a spring for quick action.

Windage adjustment:

~0.7 MOA (0.754/100m) per click with a 14.5 sight radius
~0.5 MOA (0.547/100m) per click with a 20 sight radius