It seems like certain weapons were just made to be used with certain mods, they just have a certain synergy. Im certain of it! hehe
but seriously, whether its the jackhammer with MB, takes care of the horrid spread and ups the range while reducing recoil, or the chaperone with expanded drum, it has a fast enough reload where the expanded drum doesn't make it too lengthy and its subpar damage output is alleviated as well. There are some weapons that seem kind of versatile when it comes to mods, the dawn patrol and gatekeeper are probably prime examples of this, imo.
So what are some of weapon/weapon mod combinations youve come across that seem to work very well, so well, that you hardly ever use another mod with it?