This armorer’s manual covers nomenclature, general usage, cycle of operations, field stripping, complete detailed disassembly, reassembly, troubleshooting, and maintenance of the AR15/M16/M4 series of weapons. This manual is intended for law enforcement and military end users covering maintenance of combat rifles. This manual is not specific to any type of manufacturer but the entire family of weapons. This manual also includes proper gauging for depo level maintenance. This is manual is written by Chris Bartocci, author of Black Rifle II, and armorer instructor. Printed in color.