The ACS-21 Aiming Post features an opaque center that provides a visual reference to keep the weapon upright while targeting. Unlike many other sighting systems, the post exhibits no tendency to "drift" or visually distort should your eye position change during commonly encountered situations that require the ability to "run-and-shoot" accurately. The ACS-21 Aiming Post, is the fastest "on target" sighting system in the world, and is also used on the SUSAT (Sight Unit Small Arms Trilux) sight that is standard on the British SA80 assault rifle.
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