I recently purchased a used, never been fired P320. It hasn't had the voluntary upgrade done yet. If I were to send it back to Sig through my LGS would I have to go through DROS again? I had planned on putting an APEX trigger in the pistol but I saw in the notes that it only works on Upgraded pistols. Has anyone done the upgrade yet? Does it make a noticeable difference? How about the APEX trigger? Last thing, they make 3 different grip modules. What's the difference in the small, medium large? I'm guessing its grip diameter but i've yet to find any measurements anywhere.
Thanks
Thanks

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