Hopefully they’ll allow the ability the re-reoll SPECIFIC effects in the future, but for now that’s not the case. So make sure you know that before accidentally (pretty much) destroying one of your current favorite Legendary’s with the hope of giving it more power. The moment you apply the Legendary “upgrade” it will entirely re-roll your Legendary, so now you might end up with a Troubleshooters or Mutant’s instead.

Sad to say, but that’s simply not possible. You want to keep the Two Shot effect, but would like to turn it into a 3 star with more legendary effects. Say you have a Two Shot missile launcher. The official post makes it sound like it just adds 2 or 3 star effects on a Legendary with some good base legendary effects. THE IMPORTANT THING TO REMEMBER: Your current legendary’s do not, in any way, “upgrade”. Sit there as the game automatically reloads your weapon 2b. Legendary crafting is completely randomized, so you click your button and let RNG do the rest, so you MIGHT get absolute crap, or you might roll a bloodied (or now, I suppose, aristocrat’s) 25% fire speed, 15% reload Fixer. Opening the Pip-boy when the gun empties is what the TC wants. Legendary crafting is a GREAT system, but there’s a couple things you need to be fully aware of before you make the beautiful same mistake I did… and completely destroy a legendary you liked.

Fallout 1 how to reload