In use by the US Army, Marine Corps, and numerous law enforcement agencies worldwide.
The KAC Flip up Rear Sight, 300 meter model is the oldest and most proven rear backup iron sight on market: it was the original BUIS issued for US SOCOM's SOPMOD program. This Knight's Armament Corporation rear backup iron sight features an aluminum base, and a steel post for long term durability. The removalable polymer peep sight insert is removable for low light use, and offers excellent day time accuracy. Adjustable for windage, this medium range back-up sight is
This is a simple, and excellent backup iron sight for any configuration of the AR-15/M16 family of rifles.