40-MM G Launchers M203 and M79 U.S. Army 1972 (FM 23-31) standard paper US Army Field Manual, 102 pages, size is 8 1/4" x 10 3/4", dated 1 May 1972. This is a "WELL DONE" REPRO copy.... REPRINTED IN 1975... Manual is titled - FM 23-31, 40-MM Grenade Launchers M203 and M79. Manual is designed to provide information and instructions on the use, care, cleaning, marksmanship and employment of both the M79 and M203. Chapters in this manual cover the following - Introduction, Characteristics, Launcher Controls and Sighting Equipment of 40-MM Grenade Launcher, M203; Mechanical Training, Operation and Functioning; Ammunition, Maintenance, Marksmanship Training (M203), Range Construction, Range Firing, Characteristics, Launcher Controls and Sighting Equipment of 40-MM Grenade Launcher, M79, Mechanical Training, Operation and Functioning, and Maintenance, Marksmanship Training (M79), Indirect Fire Role M79, Ammunition, Training Aids. Illustrated using primarily photographs and some line drawings.