I keep track of all the rounds I fire through my guns. Nothing fancy, just a text file for each gun where I track the date, the ammo type, and the number of rounds. Plenty good enough for me...
Now my conundrum. I just bought a P220 Carry SAO. I already have a P220 full-size DA/SA. I intend to swap the full-size upper onto the SAO, though I would expect the full-size still to see some occasional use on the DA/SA frame.
What to do? I want to say that tracking rounds through the barrel is more important, but all my files are organized by frame (that is, by S/N).