SIG SAUER SIG556xi - Manual (Page 61)

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6.2 function check
each time the weapon is stripped, verify its functions as follows:
sequence of Procedure
1. unload in accordance with section 4.0.
2. remove magazine.
3. ensure that charging handle is forward and bolt is closed.
4. functions:
a. With safety lever on “S” execute loading cycle, pull the trigger. • Hammer must not drop, the trigger must be blocked.
b. With safety lever on “F”, pull the trigger and hold it back. • Hammer must drop.
With the trigger held down, cycle the weapon once. • Hammer must not drop.
Release the trigger and pull it again. • Hammer must drop.
NOTE: Steps c, d and e apply only to Select-Fire rifles. For Semi-Auto proceed to Step 6.