A.R.M.S. Inc. #40 Rear
BUIS Sights have a long history of performance. Ideally suited for
the AR15/M16 and M4A3 Flat Top pattern rifles, these sights have a low
profile for mounting behind your combat optics or Red-Dot sights such as
the popular EOTech HWS and Aimpoint Comp style sights. The #40 BUIS
sights are spring loaded and deployable in a split second. When not in
use, the rear sight is held down with a lock down latch that is easy to
operate with bulky gloves or wet conditions.