[5e OGL] Certain Weapons Crit on a 19?

Hello, I'm running a game with the 5e OGL Compendium Compatible Character Sheet, and one of my characters has a certain weapon that crits on a 19; and I want it to roll the automatic extra damage as it does on a natural 20, however I can't quite figure out how to get this working. I've tried adjusting it so that the core die is 1d20cs>19, but that makes every other roll that is a 19 show up a critical, which I don't want. It would also be nice to set the critical failure number, because I have a gunslinger fighter whose gun jams on a 1 or 2, and I would like the 2 to show up red so I don't have to hover over it to see if the roll before added modifiers is a 2. Thank you! Chiefwiggy

You can adjust the Crit Range on individual attacks like so. For this weapon I set the crit range 19cf<2 to show that it will crit on a 19-20 but fail on a 1-2.

Thank you so much! I always thought that was a feature in DND I wasn't using, like that certain weapons only critted if the character was within a certain distance. That is so useful!