Zeroing aligns the M68 Close Combat Optic’s aiming reference with the firearm and ammunition at a selected distance and under stated conditions. The process begins with mounting, inspection, and a repeatable group—not with chasing individual impacts.
Confirm the configuration
Identify the exact M68 variant, mount, adjustment value, ammunition, weapon, target, and prescribed zero. Procedures differ across models and organizations. Current technical manuals and unit policy control the official process.
Inspect the mount and optic
- Confirm the optic is mounted on the intended receiver rail position.
- Verify correct hardware engagement and required torque.
- Check the lens, battery, brightness control, and adjustment caps.
- Ensure other equipment does not contact or shift the optic.
- Record or mark the configuration if required.
Choose a stable position
Use the most stable authorized position and support available for zeroing. The objective is to reduce avoidable shooter variation so the center of the group can be located. Equipment should be arranged consistently and without forcing an unnatural point of aim.
Use a repeatable visual relationship
Select a dot brightness that is visible without excessive bloom. A consistent head position can reduce parallax-related error at short zeroing distances. Keep the aiming point precise and unchanged throughout the group.
Fire a group before adjusting
Use the number of shots required by the current procedure. If the group is too dispersed to identify a meaningful center, diagnose stability, aiming, trigger control, mount security, or ammunition before moving the optic.
Move the group center
Measure the horizontal and vertical difference between the group center and the prescribed point of impact. Convert that difference using the target grid or the optic’s documented adjustment value, then make the correction in the indicated direction. Do not assume every M68 variant or mount uses the same click value.
Repeat and confirm
Fire another group after adjustment. When the group meets the standard, confirm at the required distance and under the prescribed conditions. A short-distance target is a means of establishing a relationship, not a replacement for confirmation when full distance is available.
Understand mechanical offset
The optic sits above the bore, so point of aim and point of impact differ across distance even with a correct zero. Shooters should know the offset at close range and the trajectory relationship relevant to their selected zero.
Adding armor or equipment does not mechanically move a properly mounted optic, but it can change the shooter’s position, visual relationship, and ability to perform. Confirm practical performance in duty configuration after the administrative zero is established.
Related: Optics and Red Dots Hub.