Sidearms are the last weapon class I need to max out for my grimoire. I have about 2700 kills to go, but I just don't like working on it. They all feel so weak and there doesn't seem to be much variation between them as there is with other weapon classes. Is there a "good" sidearm I should be using to get this done? I finally picked up Dreg's Promise from a Legacy Engram this weekend, maybe that's the way to go? Any advice on making this process less of a slog would be appreciated.