The Ma-deuce. One of the best early MGs, but its gotten long in the tooth and changes to the game have make it less important. Still usable if you desperately need an early MG.

Once a darling 4 star MG with good 1st mag performance, a good skill and decent performance. Her unique gear is pretty decent even. Unfortunately she got powercrept by later MGs like Kord. If you need an MG early on for some reason though, she's pretty ok.

Has the skill that makes M2HB so good (but with better numbers!), but with a little less attack in exchange for a non-garbage Accuracy score and having 16 max rounds (instead of 15) with a maxed gold ammo box, making her really good. Probably the best general purpose MG right now.

High end MG with good damage potential. Chance to fire an extra shot with every shot, and that has extra damage and can crit (it's not an autocrit, but can crit, see notes). At lvl10, it's actually very steady. With her unique gear, DPS is still extremely high vs single targets. However now we have bullshit MGs like Kord and the like, and being able to murder multiple enemies per shot is the current hotness for mobclear.