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Tech Note |
October 17, 2000
TECHNICAL NOTE 31,
Improved AR-10B Rifle Parts
BACKGROUND: Since the
introduction of the AR-10B series of rifles, ArmaLite has made improvements to several
small parts that have improved safety, reliability, or convenience. This Technical Note is
intended to advise ArmaLite's customers of the changes so that they can update their
rifles to the latest configuration.
FIRING PIN SPRING: The firing pin spring reduces the firing pin mark made
on the primer as the rifle bolt closes, and prevents the possibility of slamfire. This
mark is a characteristic of all Ml, M14/MlA, and M16 type Rifles. The latest generation of
firing pin spring has a tight end of the firing pin spring is slipped over the front of
the firing pin first. It engages a groove on the firing pin, which prevents loss of the
spring. THE FIRING PIN SPRING IS AN IMPORTANT SAFETY DEVICE AND MUST NOT BE REMOVED OR
LOST. If lost or damaged (or of the older style without the tight end) it will be replaced
by ArmaLite at no charge.
FIRING PIN RETAINER: The first firing pin retainers were machined. Later
retainers are similar to those of the M-16, but are somewhat longer. These parts are
provided in Field Repair Kits or sold as replacement parts.
EXTRACTOR SPRING PLUG: This is an elastomer plug that reinforces the
extractor spring and extends its life. The first rifles had no plug. Later rifles included
a black or brown plug. The latest plug is more precisely made, and is white or
translucent. It will be provided to AR-10 owners at no charge.
EXTRACTOR SPRING REINFORCEMENT RING: This ring was developed by the Naval
Surface Warfare Center at Crane, Indiana, for use with the M4 carbine. It was added to the
AR-10 in the Summer of 2000. It provides additional reinforcement to the heavily-stressed
extractor spring.
Firing pin retaining pins are cataloged parts.
Firing Pin Springs, Extractor Spring Plugs, and Extractor Spring Reinforcement Rings are
provided at no charge to rifle owners who need them for their rifles. Customers may
request these no-charge parts by mail or email only, providing the serial number of their
rifle(s) and a good mailing address.
MAW
Copyright © 1999 ArmaLite, Inc. |
