#BackUpRearSight
M16A2E3 Experimental Rear Sight
Have you ever seen an M16 like this before? Look closely. Right below the detachable carry handle’s rear knob, there is a piece of metal on the side of the upper receiver. Weird right? Well it is actually an experimental rear folding sight. It folds down flat and the carry handle has a notch to accommodate the stowed rear sight.
