These are the factory Magpul MBUS 3 flip-up sights. Can be purchased separately or in a set.

These sights attach to 1913 Picatinny Rail systems and can be easily activated from either side tab or by pressing the top.

Features:

• Fits Picatinny rails, but is tailored to AR15 platforms
• Color injection-molded polymer construction
• Spring-loaded flip-up design
• Detent knob easily and positively adjusts windage