SIG SAUER P320 - Manual (Page 41)

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1. ensure the magazine is removed and the pistol is unloaded (see section 6.0
“unloading the Pistol”).
2. check recoil spring function/slide travel.
a. retract the slide fully and release.
b. Verify the slide locks fully in the closed position.
c. repeat the procedure.
3. check the trigger mechanism:
a. Pull the trigger fully to the rear.
b. as the trigger is pulled rearward the striker is released causing an audible
click.
Step 2a
Step 3a - 3b