By AK with a drum I assume you mean an RPK, which is stupidly lightweight lol
MG36s......FFFFFFFFFUUUUUUUUUUUUUUUUUUU
The only REAL airsoft LMG's are the ones that weigh more than 6kg
It does come in handy in scrims, only problem, like you said, is that you'll go through a bag of ammo every scrim.....
But for big ops, oh man is it ever awesome!
And if you think not being able to hit targets at 200m sucks, I can't even imagine how frustrated real steel marksmen get lol