How often should the bore of the 81mm mortar be swabbed?

Swabbing the bore of the 81mm mortar is a critical maintenance step to ensure accuracy and safety during operations. The correct choice states that the bore should be swabbed after every 10 rounds and after every fire mission. This practice helps to remove any excessive fouling that can accumulate from the firing process, which in turn maintains the cleanliness of the mortar's bore.

Regular swabbing contributes to consistent performance and prevents issues such as misfires or round jamming that can result from residue buildup. Additionally, swabbing after every fire mission ensures that the mortar is in optimal condition for subsequent use, enhancing operational readiness and reliability. This frequency is a balance between proper maintenance and practical time management in a field environment, ensuring the mortar remains functional without imposing excessive labor on the crew.