Training Circular TC 3-20.31-242 Mastery: Gun Theory, M242 July 2025:

This United States Army manual, Training Circular TC 3-20.31-242 Mastery: Gun Theory, M242 July 2025, provides a mastery level of knowledge and understanding of the M242 25-mm Automatic Cannon's history, components, functions, capabilities as well as highlighting basic maintenance and storage techniques. The information in TC 3-20.31-242 is an accumulative development of knowledge, designed to improve Master Gunners, leaders, and crews understanding of the M242, to a level of mastery that e...