Which boresight is used on the 60mm mortar system?

The M115 boresight is used on the 60mm mortar system as it is specifically designed to align the mortar's sighting systems for accurate targeting. The purpose of a boresight is to ensure that the weapon is properly calibrated before firing, which is critical for achieving optimal accuracy and effectiveness during operations. The M115’s design caters directly to the requirements of the 60mm mortar, making it the appropriate choice for this system.

Understanding the function of the boresight helps in ensuring proper maintenance and operational readiness of the mortar system, highlighting its importance in artillery practices. The other options, while they may be related to different systems or components, do not fulfill the specific requirements set forth for the 60mm mortar, making them unsuitable for this particular application.