decon some other weapons
All you need to do is level up some other weapons/class items to have a never ending supply of any legacy you want.
Originally Posted by wesmont
Since this one is a minor, you will need to get them to at least lvl 10 to get another legacy, which is very easy to do to identify one that has the legacy you are after. You still need to get it to lvl 30 in order to be able to extract the legacy when you decon it though, which is still easy to do by questing, killing stuff, or bartering for item exp runes (but hopefully you have some of these saved, which you also get when you decon legendary items).
Check the other legendary guides here for more info on that process.
Generally, you just need to make sure the item you want to extract the legacy from will give the appropriate level legacy for the intended target item.
Roughly, I think lvl 65 items will give ones good til 75, 75 to 85, and 85 to 95.
I usually start to collect all the ones I want while leveling up, then get rid of them when they are no longer needed or useful.