Final answer:
The four steps required to mechanically zero the M16/A2 are to install the front sight post, adjust the front sight post, install the rear sight, and verify zero.
Step-by-step explanation:
The four steps required to mechanically zero the M16/A2 are as follows:
- Install the front sight post: Start by adjusting the front sight post up or down until your groupings are centered on the target. This can be done by using a front sight adjustment tool or a bullet tip.
- Adjust the front sight post: Once the front sight post is installed, ensure that it is aligned properly with the rear sight aperture. Adjust the front sight post left or right to center the front sight in the rear sight aperture.
- Install the rear sight: Attach the rear sight to the upper receiver and adjust the windage and elevation knobs to align with the front sight.
- Verify zero: Take a series of shots at a target and adjust the windage and elevation knobs as needed to center your groupings on the target.