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FM 23-10
APPENDIX B
M21 SNIPER WEAPON SYSTEM
The National Match M14 rifle (Figure B-1) and its scope makeup
the M21 sniper weapon system. The M21 is accurized IAW United
States Army Marksmanship Training Unit specifications and has
the same basic design and operation as the standard M14 rifle
(FM 23-8), except for specially selected and hand-fitted parts.
Section I
M21 SNIPER WEAPON SYSTEM
This section describes the general characteristics of the M21 SWS. The M21
has been replaced by the M24 (Chapter 2); however, the M21 is still in use
throughout the US Army.
B-1. M21 DIFFERENCES
Significant differences exist between the M21 SWS and M24 SWS.
These differences are as follows:
The barrel is gauged and selected to ensure correct specification
tolerances. The bore is not chromium plated.
The stock is walnut and impregnated with an epoxy.
The receiver is individually custom fitted to the stock with a
pound.
The firing mechanism is reworked and polished to provide for a
crisp hammer release. Trigger weight is between to pounds.
The suppressor is fitted and reamed to improve accuracy and
eliminate any misalignment.
The gas cylinder and piston are reworked and polished to improve
operation and to reduce carbon buildup.
The gas cylinder and lower band are permanently attached to each other.
Other parts are carefully selected, fitted, and assembled.
B-1
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FM 23-10
B-2. INSPECTION
If the sniper discovers a deficiency while inspecting the rifle, he reports it
to the unit armorer. The following areas should be inspected:
Check the appearance pleteness of all parts. Shiny surfaces
should be treated.
Check the flash suppressor for misalignment, burrs, or evidence
of bullet tipping. The suppressor should be tight on the barrel.
Check the front sight to ensure that it is tight, that the blade is
square, and that all edges ers ar