"This manual is published for the information of the using arms and services. In addition to a description of the 75-mm Rifle T21, this manual contains technical information required for the identification, use, and care of the materiel, ammunition, and accessory equipment."--Page 1.

"To provide operating instructions with the materiel, this Technical Manual has been published in advance of complete technical review. Any errors or omissions will be corrected by changes or, if extensive, by an early revision."--Page 1.

Introduction --General -- Description and data -- Tools, parts, and accessories -- Operating instructions -- General -- Service upon receipt of equipment -- Controls -- Operation under usual conditions -- Operation under unusual conditions -- Demolition to prevent enemy use -- Maintenance instructions -- General -- Preventive maintenance service -- Malfunctions and corrections -- Breech mechanism -- Barrel and chamber -- Auxiliary equipment -- Ammunition -- Fire control equipment -- Appendix -- Storage and shipment -- References.