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OPERATOR'S MANUAL GRENADE LAUNCHER, 40-MM: M203, GRENADE LAUNCHER, 40-MM: M203A1, TM 9-1010-221-10

The safest, easiest, and best way to operate the M203 40-mm Grenade
Launcher is to use this manual. Learning to use this TM is as easy as
reading through this section. Knowing what is in this manual and how to use it will save you time and work and will help you to avoid exposing yourself to unnecessary hazards while performing your job.

This manual covers the operation of the M203 and M203A1 40-mm Grenade Launchers. The manual itself is divided into five chapters. Chapters are divided into Work Packages. The five chapters, and what they contain, are found in the Table of Contents in the front of this manual. For example, to learn about operating the grenade launcher, you would look in the table of contents and discover that Chapter 2 provides all pertinent information about the operation of the grenade launcher. Since Chapter 2 covers a great deal of information, you will have to scan the chapter to find the specific information you will need.

CHAPTER 1 - DESCRIPTION AND THEORY OF OPERATION
Equipment Description and Data
Theory of Operation
CHAPTER 2 — OPERATOR INSTRUCTIONS
Description and Use of Operator Controls and Indicators:
Leaf Sight
Quadrant Sight
Barrel Latch
Trigger and Safety
CHAPTER 2 — OPERATOR INSTRUCTIONS (Cont)
Operation Under Usual Conditions:
Preparation for Firing
Firing Techniques
Range Estimating
Loading and Firing
Clearing
Hangfire
Misfire
Unloading
Operation Under Unusual Conditions:
Unusual Environment/Weather
Nuclear, Biological, and Chemical (NBC) Decontamination
Procedures.
CHAPTER 3 — TROUBLESHOOTING PROCEDURES
Troubleshooting Index
Operational Checkout and Troubleshooting Procedures
CHAPTER 4 — MAINTENANCE INSTRUCTIONS
Preventive Maintenance Checks and Services (PMCS)
Introduction
PMCS Procedures
Lubrication Instructions
Inspection of Installed Items
Disassembly
Cleaning
Assembly
Lubrication
Test and Inspection
CHAPTER 4 — MAINTENANCE INSTRUCTIONS (Cont)
Use of Quick Release Bracket:
Cleaning/Lubrication
Dismounting from M16A4 Rifle or M4/M4A1 Carbine
Mounting to M4 Carbine
Mounting to M16A4 Rifle
Mounting Leaf Sight and Rail Grabber Assembly
Ammunition Marking Information
CHAPTER 5 — SUPPORTING INFORMATION
References
Components of End Item (COEI) and Basic Issue
Items (BII) Lists
Additional Authorization List (AAL)
Expendable and Durable Items List
ALPHABETICAL INDEX