As a fellow redditor was kind enough to show in a video, you can get away with firing an LMG singlehandedly:
I remember back in the closed alpha and beta days when they were actually fun to use.. Right now, the recoil is so bad that your only option is to either stay still bipoded as sniper bait, or corner camp objectives.
Before people bring up the balance argument, well, Insurgency is an assymetrical tactical shooter, and as it stands now, MGs are unusable in the role they occupy IRL. Plus there's usually only one of them on the field due to role restrictions. Even back then, when they were universally coveted, class restrictions prevented any overt OPness.
I would propose that MGs are made to reflect the two reasons they're not universally used in the battlefield: weight, and clunkiness indoors. Insurgency has both mechanics, and making them unwieldy indoors is obviously superior to making them useless anywhere.
As others have suggested, the role could be balanced by making LMGs expensive pointwise and discouraging use of secondary equipment like pistols and tons of nades. In addition, I would recommend making carriers cheap for them, to reflect their utility arising from spitting tons of hot lead downrange.
Hopefully the devs are listening!