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For other uses see M4
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The Aimpoint CompM4 is a tubular red dot sight adopted by the US Military. The Comp M4S variant moves the battery compartment to the bottom of the sight rather than the top.
"A modern close combat optic, the Comp M4S has a battery compartment located low on one side to power the red dot reticule"
— Battlelog Description
The Comp M4S appears as an optical attachment in Battlefield Hardline. It provides a 2x optic magnification similar to the FLIR.