SIG SAUER P320 - Manual (Page 42)

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4. check slide catch lever.
a. insert an empty magazine.
b. retract the slide fully and release.
c. Verify the slide is locked to the rear by the slide catch lever.
d. depress the slide catch lever.
e. Verify the slide is released and closes in the locked position.
f. remove the magazine.
Step 4a, 4b & 4c Step 4d & 4e
Step 4f