The M68 Close Combat Optic (CCO) is the Army designation applied to issued Aimpoint red-dot sights. It provides an unmagnified illuminated aiming reference for the M16 and M4 families. Exact controls, reticle size, battery, and mount depend on the model in service.
How the sight works
An LED projects light onto a coated internal lens, which reflects the aiming dot toward the shooter. The sight does not project a laser onto the target. Because the dot is viewed through the optic, it can be used in varied lighting without revealing a visible beam downrange.
Use the appropriate dot brightness
The dot should be bright enough to locate without blooming across the target. Excessive brightness makes the aiming reference appear larger and can reduce precision, particularly in low light. A setting that works outdoors may be unsuitable indoors or with night-vision equipment.
Parallax and eye position
Red-dot sights reduce the need to align front and rear sights, but they are not perfectly free of parallax error under every condition. Eye position, target distance, and the precision required still matter. When accuracy demands are high, a repeatable head position helps limit error.
Both-eyes-open use
Many shooters can use the M68 with both eyes open, preserving more visual information around the optic. This is a capability rather than an absolute rule. Eye dominance, injury, lighting, visual obstruction, and the shooting position may change what works.
Mounting considerations
- Mount only on the upper receiver unless the approved configuration specifies otherwise.
- Use the correct mount and torque procedure.
- Confirm that the sight and controls do not interfere with other equipment.
- Choose a position that supports the needed field of view and access.
- Mark or inspect fasteners according to the maintenance plan.
Moving the optic changes the system and requires confirmation of zero. Mounting on a non-rigid or separately moving handguard can introduce inconsistency unless that configuration is specifically designed and approved for it.
Zero and mechanical offset
The optical axis sits above the bore. At close distances, the projectile will normally strike below the dot by an amount related to sight height and trajectory. Shooters must understand the selected zero and its point-of-impact relationship across expected distances.
Pre-use checks
Verify mount security, lens condition, brightness, battery condition, and confirmed zero. Keep adjustment caps, battery compartments, and protective features configured according to the technical manual. Carrying spare power is sensible even when battery life is long.
This article explains general principles. Issued model specifications and required procedures change, so current technical manuals, unit SOPs, and qualified instruction control mounting, maintenance, zeroing, and use.