SIG SAUER SWISS ARMS SG552 - Manual (Page 25)

5.2.2. Trigger in safe position "S”
The safety lever (6) is set to "S”.
The safety shaft (7) locks the trigger (8).
5.2.3. Semiautomatic fire
The safety lever (6) is set to "1” and the hammer (3)
is held by the trigger rod (4).
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Function
In the final stage of the advance, the bolt head (5) locks
up and the release bar (6) is depressed. The weapon is
ready to be fired. 5.2. Trigger functions
5.2.1. General
Home position for describing the trigger functions:
• the hammer (3) ist held by the trigger rod (4)
• the release bar (2) is depressed by the bolt carrier (1)
• the sear (5) is not engaged.
Function
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illu. 63) Trigger mechanism in cocked position illu. 62) Locking illu. 65) Trigger mechanism before firing illu. 64) Trigger in safe position "S”