What does the M115 denote in the context of 60mm mortars?

In the context of 60mm mortars, M115 specifically refers to the boresight kit. The boresight kit is used to align the mortar tube with the aiming point, ensuring accurate targeting and effective fire. This is a crucial component in the overall operation of the mortar system as it allows for precise adjustments and improvements in firing accuracy.

The boresight kit facilitates the initial alignment during the setup of the mortar and is essential for ensuring that subsequent rounds impact in the correct location. By providing the necessary means to visually or mechanically align the mortar tube before firing, the M115 enhances the effectiveness of the mortar system in combat scenarios.