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A field experiment was conducted to determine whether a circular bracketin sight mounted on a standard M16Al rifle could enhance the effectiveness of the weapon in a short-range, quick-fire environment against a moving target. Circular bracket sights of 1.32 and 2.64 ins. in diameter were used. Human silhouette targets appeared moving along a track at 6 mph. at distances of 25 and 50 yds. and remained exposed for approximately 2.5 secs. Subjects were infantrymen who engaged the target (single-shot) with each sight and at each direction of target movement (right-left) and range. An unmodified M16Al sight was tested by the same subjects for comparison using standard quick-fire techniques.