The M16A1 Rifle: Operation and Preventive Maintenance is a technical manual book that provides detailed instructions for maintaining, assembling, and disassembling the 5.56mm M16A1 rifle. Produced in the United States, this original book is designed for individuals interested in militaria and offers a comprehensive look at the operation and maintenance of this iconic rifle. With a compact size of 7.250" x 5" inches and 30 illustrated pages, this manual serves as a valuable resource for collectors and enthusiasts of military firearms.