Which document covers the M4A1 Carbine?

The document that covers the M4A1 Carbine is TC 3-22.9. This training circular provides comprehensive guidance on the operation, maintenance, and marksmanship with the M4A1 Carbine, detailing its features and functions, as well as instructional procedures for training soldiers on how to use it effectively. It serves as an essential resource for soldiers and non-commissioned officers to understand weapon handling, safety protocols, and tactical employment of the carbine in various combat scenarios.

The other documents, while they may cover other aspects of weapons or equipment, do not specifically focus on the M4A1 Carbine in the same comprehensive manner as TC 3-22.9. For instance, FM 3-22.68 may discuss general characteristics of infantry weapons, AR 700-138 pertains to Army supply policies, and TC 3-22.50 addresses the M16 series of rifles, thus lacking the specific focus on the M4A1 Carbine required for thorough understanding and training.