Here are a few comparison pics. First, side by side, P365 and P365XL.
Next, with the uppers switched.
Visually, I can see no difference in the FCU's while in the frame. My P365 FCU takedown lever has a tendency to spring back. Then you have to lift up on the slide lock in order to rotate it back to the assembly/disassembly position. Also with the P365, if you pivot the takedown lever a little bit when in the assembly/disassembly position, you can feel spring tension on it and see the sear bob up and down. On the XL, the takedown lever stays put with no spring tension on it and does not move the sear when rotated a little.
I will look at the FCU's more closely side by side, removed from the grip after I shoot tomorrow.
Y'all think we should start a dedicated range report thread or just post it here?