3 bolt – SIG SAUER SIG 551-A1 Rifle User Manual
Page 17
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17
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.
Bolt Carrier
Bolt HeaD
12SIG541_SIG551_A1MiniManual_Rev1.indd 17
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