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The latest, most cutting-edge military rifle is the M4 version of the M16A2. Basically, the M4 is a modular weapons system featuring a foreend with Picatinney rails for mounting the operator's choice of white lights, night vision devices, lasers, vertical grips and other accessories. The receiver of an M4 is flat -- no carrying handle - and also features a Picatinney rail for mounting different types of sights.
Now if you remember your basic M16 characteristics, the carrying handle houses the rear sight. Take off the carrying handle, and there goes your rear sight.
GG&G, of Tucson, Ariz., Manufactures by far the best backup iron sight for an M4 or any other flattop AR. It is a fold-down, popup design that affixes to the receiver s Picatinny rail, ready for use in an emergency.
GG&G makes two versions of their flip-up sight. The first is a traditional M16A2 style with an L-shaped folding peep, one for CQB and one long ...
Source: HighBeam Research, GG&G Flip-Up Sight.