What are the two reasons to boresight?

• A. To calibrate GPS and check battery
• B. Temperature change of +/-15 degrees and systems checkout
• C. To adjust focus and lens alignment
• D. To test grip integrity

Answer: (B)

Boresighting is the process of aligning the sight with the weapon’s bore so that the point of aim matches the bore axis. The two reasons to boresight are to account for changes that can tilt or shift the alignment and to verify the overall system is ready for use. Temperature swings, such as a change of around +/-15 degrees, can cause slight expansion or contraction of optics and mounts, which can drift zero; reboresighting after such a change helps maintain accuracy. A systems checkout during boresight ensures all parts involved in aiming—sighting optics, electronics, and mechanical linkages—are functioning correctly and properly zeroed, catching faults before live-fire use. The other options don’t relate to aligning the bore with the sight or to verifying the readiness of the aiming system.