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here is the sig link to the trigger update If this does nit help call sig at Phone: 603.610.3000, option 1 Hours: Monday-Friday: 8:30am – 6pm EST https://www.sigsauer.com/support/p320-voluntary-upgrade/ The video should answer your questions

William, you will be able to tell quickly visually here : (https://www.sigsauer.com/support/p320-voluntary-upgrade/)

William, The easiest way is to remove the slide, turn it upside down. With the barrel opening to you left as you are look down on the slide. On the right side of the slide (rear) there should be a notch (sort of a small half circle) cut into the slide. It may or may not be coated with a protective finish. On my P320 which was an earlier model, I had to send it back to the factory for the upgrade. The notch in mine does not have any protective coating. There are several other changes made to the original P320, but the slide notch is the easiest to see if one is not familiar with all the differences between the original and updated version. I highly doubt that you have an older model, especially if you bought it from Buds as their inventory turns over fairly quickly with popular gun models. You can go on YouTube as do a search of P320's. There is a plethora of videos on all the changes Sig made and should give you more peace of mind about your new Sig. There are also a lot of tips and t