only m27 so far. I use lmg's a lot. Most cod's got a lot of them completed.
I would say try, try and try some more. don't be forced to use a setup because people say it's good. You might like another sight for example. And when you switch lmg's try different attachments again.
Gameplay wise. Domination is a good game for LMG's when you defend. But keep in mind you're slower.
I will play KC with it and will still run for tags. Just because why not.
Lsat + thermal n silencer or armor piercing rds
Takedown ( 1 of best perks in game, really no counter to it that I have figured out)
Incognito (better than off the grid n Dead silence, it shuts ur character up and enemies don't automatically call out ur position like "he's out in the open" or "sniper on second floor" many ppl don't know that hidden feature
P226+silencer or kastet (the kastet has 95 percent move speed which is about same or better than pistols)
Thermobaric (everyone runs blast shield. Thermobaric does 50 base damage n goes through armor + huge blast radius - most powerful equipment in hc cause base damage is instant kill, works on vests, juggs, maniac, and most ground kill streaks except dog)
I mainly play hc kc but have used a mix of the above combos in core dom n kc. Thermobaric followed by kastet rounds are room/flag clearing power house) Lsat has high rpm+ready up = hip fire machine if caught off guard, thermal n silencer no need for explaining
I run n gun, hunt tactical loiterers cap flags n snag tags with that setup. Rarely go negative or not have most caps n defends or tags. Stay on perimeter but keep moving throw ammo/vests for ur team but also as a lure for enemies with Sitrep n pick off.
I just blew the cover off. Watch how many ppl use this now. Lot of experimenting n watching what perks n equip most players use.
Hate mail hilarity courtesy of a run n gun objective playing lmg user