Today I received a 40 cal full size conversion kit for the 9mm Carry P320 pistol I bought last year.
With the kit came a new slide catch and a spring (no spring post included).

Do I need to change out the existing slide catch in my lock work? This pistol was sent back to SIG last year for the "voluntary upgrade" and had the trigger replaced.

I would have called SIG today but I'm pretty sure they are closed on weekends.

Thanks in advance for your answers.

Mike

The change to the slide catch lever was made prior to the drop safe upgrade.
If you are just going to use the slide with your current grip module you do not need to change the lever.
If your FCU fits in the new new grip without interference, you do not need to change the lever.
If you want to use the new grip and your current slide stop lever interferes when you try to insert the FCU, then you need to change it.

Thanks, Rich. My original 9mm FCU appears to have the later type lever.