User guide

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4.0 Function
4.1 General Weapon Function of SIG551-A1
4.1.1 Ready to Fire
When the rifle is in a “ready to fire” condition the bolt is closed and locked.
• the recoil spring (2) holds the bolt carrier (4) in the front final position, via the gas piston (1).
• the bolt head (5) is rotated by the control cam (3) of the bolt carrier (4) in such a way that its locking lugs (8) engage
in the corresponding recesses of the locking piece (9).
• in this position the hammer (7) is cocked and the release bar (6) is depressed.
WARNING
DO NOT TOUCH THE TRIGGER
UNTIL YOU ARE ACTUALLY READY TO FIRE THE RIFLE.
12SIG541_SIG551_A1MiniManual_Rev1.indd 44 2/17/12 2:48 PM