Manual

SIG 556 Operators Manual 10 P/N 1511203 VER 12.7.2
2.1.3. Bolt
The bolt consists of two main parts:
• Bolt Carrier
• Bolt Head
a. Bolt Carrier: The bolt
carrier guides the bolt head,
controls the locking and
unlocking by means of the
cam, holds the operating
rod, and cocks the hammer.
b. Bolt Head: The bolt head
locks the bolt assembly,
houses the firing pin and
extractor and feeds the car-
tridges from the magazine
to the chamber.
2.1.4. Hand Guards
The hand guards protect the barrel and the gas system from
damage and provide protection from burning. The integrated
accessory mounting rails provide attachment points for various
devices, such as lights, lasers, sights, and bipods.
SIG556 OM 12.06.qxp 1/8/2007 2:25 PM Page 10