Technical data
TM 9-1005-319-23&P
DISCLOSURE NOTICE - This information is furnished upon the condition that it will not be released to another nation
without the specific authority of the Department of the Army of the United States; that it will be used for military
purposes only; that individual or corporate rights originating in the information, whether patented or not, will be
respected; that the recipient will report promptly to the United States any known or suspected compromise; and that the
information will be provided substantially the same degree of security afforded it by the Department of Defense of the
United States. Also, regardless of any other markings on the document, it will not be downgraded or declassified
without written approval of the originating United States agency.
DISTRIBUTION STATEMENT C
- Distribution authorized to U.S. Government agencies and their contractors. This
publication is required for administration and operational purposes, as determined 26 October 2005. ARMY ONLY:
Other requests for this document shall be referred to U. S. Army TACOM Life Cycle Management Command, ATTN:
AMSTA-LC-LMPP/TECH PUBS, 1 Rock Island Arsenal, Rock Island, IL 61299-7630. AIR FORCE ONLY: Other
requests for this document must be referred to 542 CBSS/GBHDE, Robins AFB, GA 31098-1813.
WARNING
- This document contains export-controlled technical data whose export is restricted by the Arms Export
Control Act (Title 22, U.S.C., Sec 2751 et seq) or the Export Administration Act of 1979, as amended, Title 50A, U.S.C.,
App. Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with provisions
of DOD Directive 5230.25.
DESTRUCTION NOTICE
- Destroy by any method that will prevent disclosure of contents or reconstruction of the
document.
TABLE OF CONTENTS
WP Sequence No.
Page No.
Warning Summary
How To Use This Manual
CHAPTER 1 — GENERAL INFORMATION, EQUIPMENT DESCRIPTION,
AND THEORY OF OPERATION
General Information .................................................................................................................. WP 0001
Figure 1. External View of 5.56mm Rifle, M16A2 .................................0001-1
Figure 2. External View of 5.56mm Rifle, M16A3 and M16A4 ............0001-2
Figure 3. External View of 5.56mm Carbine, M4/M4A1 .......................0001-3
Equipment Description and Data ............................................................................................. WP 0002
Figure 1. Major Components of Rifles and Carbines.............................0002-2
Theory of Operation ................................................................................................................... WP 0003
Figure 1. Operation of Rifles and Carbines............................................0003-2
CHAPTER 2 — FIELD TROUBLESHOOTING PROCEDURES
Troubleshooting Index ............................................................................................................... WP 0004
Troubleshooting Procedures...................................................................................................... WP 0005
Table 1. Troubleshooting Procedures....................................................0005-1
Figure 1. Magazine Catch Inspection .....................................................0005-2
Figure 2. Magazine Catch and Spring Inspection .................................0005-3
Figure 3. Action Spring............................................................................0005-3
Figure 4. Bolt Carrier Assembly Inspection...........................................0005-4
Figure 5. Extractor Spring Assembly Inspection...................................0005-4
Figure 6. Gas Tube...................................................................................0005-5
Figure 7. Action Spring Inspection .........................................................0005-5
Figure 8. Hammer and Burst Cam Inspection.......................................0005-6
Figure 9. Firing Pin Retaining Pin Inspection.......................................0005-7
Figure 10. Selector Lever and Firing Pin Inspection...............................0005-7
ii










