What tool is used to detect dents and minor damage in the M203?

The bore constriction check tool is specifically designed to measure the internal diameter of the M203 grenade launcher’s barrel to identify any obstructions or irregularities that could indicate dents or minor damage. By checking for variations in bore size, this tool helps ensure that the weapon will function safely and effectively. Detecting such issues is essential for maintaining the integrity and performance of the weapon.

The other tools mentioned are less relevant to assessing the specific condition of the M203 regarding dents or minor damage. Caliper tools are primarily used for external measurements rather than internal bore assessments. Depth gauges measure the depth of features, which may not directly relate to detecting damage within the bore. Impact testers are used to assess material properties under stress but are not utilized for inspecting the bore for dents or structural integrity. Thus, the bore constriction check tool is the most appropriate choice for this specific task.