Great things come in small polymer packages. The MBUS 3 Sight – Rear brings tool-less windage and aperture adjustment to a rear sight that’s ready when your primary optic isn’t. It stows at just 0.55” tall and 1.38” wide on your M1913 picatinny rail and includes ambidextrous deployment capability and two aperture options for different shooting scenarios. Compact (0.55ʺ tall when folded; 1.38ʺ wide) and lightweight (1.06 oz) polymer rear sight optimized for mobility, durability, and reliabilityAttaches to M1913 Picatinny railsSpring-loaded, ambidextrous button for quick deployment from stowed positionTool-less windage adjustment for on-the-fly flexibility as your situation changesRapid-select, rotating aperture window allows a wide or narrow view for close-range shots (or low light situations) and longer distance shootingStandard AR sight height for across-the-board compatibility