	*FM 3-22.31 (FM 23-31)
FIELD MANUAL NO. 3-22.31	HEADQUARTERS DEPARTMENT OF THE ARMY Washington, DC, 13 February 2003

FM 3-22.31

40-MM GRENADE LAUNCHER, M203

PREFACE
CHAPTER 1. INTRODUCTION
	1-1.	Training Strategy
	1-2.	Combat Conditions
CHAPTER 2. OPERATION AND FUNCTION
	2-1.	Operation
	2-2.	Loading
	2-3.	Unloading
	2-4.	Cycle of Functioning
CHAPTER 3. DESCRIPTION AND MAINTENANCE
	3-1.	Description
	3-2.	Technical Data
	3-3.	Components
	3-4.	Ammunition
	3-5.	Clearing Procedures
	3-6.	General Disassembly
	3-7.	Cleaning and Lubrication
	3-8.	Inspection
	3-9.	General Assembly
	3-10.	Care and Handling
	3-11.	Care and Handling Under NBC Conditions
	3-12.	Decontamination
CHAPTER 4. PERFORMANCE PROBLEMS AND DESTRUCTION
	4-1.	Malfunctions
	4-2.	Stoppages
	4-3.	Immediate Action
	4-4.	Remedial Action
	4-5.	Destruction Procedures
CHAPTER 5. MARKSMANSHIP TRAINING
Section I. Preliminary Marksmanship Training
	5-1.	Four Fundamentals of Marksmanship
	5-2.	Limited Visibility
	5-3.	NBC Environment
	5-4.	Fire Commands
	5-5.	Dry-Fire Exercises
	5-6.	Sensing and Adjustment of Fire
	5-7.	Grenade Launcher Range Layout
	5-8.	Description of Range and Targets
Section II. Basic Gunnery
	5-9.	Zeroing the M203 Grenade Launcher
	5-10.	Overall Qualification Standards
	5-11.	Day Record Fire
	5-12.	Day Record Fire Qualification Standards
	5-13.	Mounting the AN/PVS-4 (Without the Rail System)
	5-14.	Zeroing the AN/PVS-4 to the M203
	5-15.	Night Record Fire
	5-16.	Night Record Fire Qualification Standards
CHAPTER 6. COMBAT TECHNIQUES OF FIRE
Section I. Advanced Gunnery
	6-1.	Characteristics of Fire
	6-2.	Classes of Fire
	6-3.	Range Estimation
	6-4.	Predetermined Fires
	6-5.	Types of Targets
	6-6.	Decontamination
Section II. Fire Control
	6-7.	Methods of Fire Control
	6-8.	Fire Commands
Section III. Application of Fire
	6-9.	Suppressive Fire
	6-10.	Overwatch Fire
	6-11.	Area and Point Fire
	6-12.	Target Engagement
	6-13.	Limited Visibility
	6-14.	Overhead Fire
CHAPTER 7. TRAIN-THE-TRAINER PROGRAM
Section I. Organization
	7-1.	Objectives
	7-2.	Mission-Essential Task List
	7-3.	Trainer Assessment
	7-4.	Assistant Trainers and Cadre Coaches
	7-5.	Command Benefits
	7-6.	Program Phases
Section II. Training Tasks
	7-7.	Phase I, Preliminary Marksmanship Instruction
	7-8.	Phase II, Basic Gunnery
Section III. Trainers' Certification
	7-9.	Training Base
	7-10.	Certification Outline
APPENDIX A. 40-MM GRENADE LAUNCHER, M79
APPENDIX B. UNIT TRAINING PROGRAM
APPENDIX C. PROFICIENCY (PERFORMANCE) EXAMINATION
APPENDIX D. RANGE SAFETY
APPENDIX E. STANDARDS, STRATEGIES, AND REQUIREMENTS
GLOSSARY
REFERENCES
AUTHENTICATION

DISTRIBUTION RELEASE: Approved for public release; distribution is unlimited.
_____________________________
*This publication supersedes FM 23-31, 20 September 1994, and rescinds
DA Form 2946-R, July 1974.

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FM 3-22.31

40-MM GRENADE LAUNCHER, M203

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