SIG SAUER P556 - Manual (Page 11)

P556 Pistol Operators Manual
11
1511582 VER 08.01.08
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
cartridges from the
magazine to the chamber.
2.1.4. Hand Guards
The hand guards protect the
barrel and the gas system from
damage. They also provide ergonomic positioning of the hands
during operation as well as protecting the hands from burns.