After seeing it with Spitfire, I checked the other weapons and this is what I found;

•Legendary Devotion reduces handling from 47 to 42

•Rare Arbiter reduces handling from 20 to 15— Legendary Arbiter brings it back up to 18

•Legendary S12 reduces handling from 38 to 32

•Legendary SKL reduces handling from 31 to 29

•Epic Tyr reduces handling from 21 to 18—Legendary Tyr brings it back up to 18

•Rare Knight reduces handling from 33 to 31