What you've just said literally makes no sense. It's a mid - long range weapon, which you've stated correctly, but you've also said it has a short range of use which contradicts the first part of you statement and is alos incorrect. I use LMGs across the map as I did on MW3, the range is amazing on them, very effective against snipers. Not sure what that corridor thing is about, you a camper? They're best used from a vantage point with good lines of sight as a supressing weapon.