The Magpul MBUS Gen 2 Back-Up Rear Sight mounts on most AR-15/M-16 firearms and Picatinny and STANAG 4694 rails. Made of lightweight, impact-resistant polymer, this rear sight has a detent knob that lets you easily and positively adjust the windage and folds with either the large or small aperture in position. Made in USA. Magpul MBUS Gen 2 Back-Up Rear Sight Black - Shooting Supplies And Accessories at Academy Sports
