Twice I've gotten the sustain trait as the random trait on a rocket launcher (once with the missile launcher, the other time I think it was a normal rocket launcher). This sounds powerful, except that it doesn't work--even when you kill something with a direct hit rather than splash damage, you don't get your rocket back.
This combination would possibly be a bit overpowered if it worked, but if it's not going to work it shouldn't show up.
