We were at the shot show and saw Amend2 making a P365 lower conversion that is made for P320 parts. Are the standard P365 and P320 parts interchangeable or is this something that can’t be done with factory Sig parts?

I guess I could ask the Sig reps tomorrow, but I’m sitting in the hotel and figured I’d ask here.

I would think the upper portion of the lower receiver is wider than a standard P365, in order to accommodate the P320 internal parts. The grip is the width of the P365 so you can use P365 magazines. So overall, the pistol would have the width of the P320.