Which adjustment is necessary for a click on an M4 rifle?

The correct adjustment for a click on an M4 rifle is 1 MOA (Minute of Angle), which is approximately 1.047 inches at 100 yards. This means that each click of the windage or elevation adjustment will shift the point of impact by about 1 inch at 100 yards.

It's important to understand this measurement because the accuracy and precision of adjustments on a rifle are crucial for marksmanship. A click adjustment of 1 MOA is standardized across many firearms, including the M4, and serves as the basis for making necessary fine-tuning adjustments based on shooting distance and environmental factors.

Therefore, recognizing that adjustments in marksmanship follow this standard is key to achieving accuracy when engaging targets at varying distances. The other options do not accurately reflect the standard click adjustment used in the M4 rifle system.