Yeah, LMG grens are a pain to deal with their fast vetting and fast killing. Molotovs can ward them away if the enemy player is un-attentive or you are lucky, but I don't even think that PPSh is a valid match for LMG42s. An SVT-40 upgrade would be nice.
The only way i've found is to just overwhelm it's support and isolate it. You need to make sure it's alone or somehow take out or ward it's support off, and flank it with maybe some rear AT grenades or a ram
lol really?
It costs 100 muni.
Things that cost less or the same muni and do similar/the same:
The precision strikes on 152mm and Katyusha
A grenade or two, a satchel.
A demo charge
Several mines