I really hated how the Infinity Saga Black Widow used the lower body and legs of the really outdated Winter Soldier version.
Especially hated the molded holsters. By a stroke of luck, I had used an extra Infinity War one to make another random Widow. The new torso fits onto the old one almost perfectly.
If posed at extreme angles, you will see a little gap on the torso split though, but overall, I'm really happy with how it turned out.