Hmmm - those Ork upgrades have proved too difficult to implement automatically. Given there can be multiple upgrades on a single weapon the formulas become too complex.
It's pretty simple to edit the weapon stats and adjust the range/pen/damage/qualities manually on the weapon sheet.
Copy the cell and paste as value. This will copy the calculated text into the cell (instead of the formula). You can then edit the text to apply the affects of the Kustom upgrade.