There's no secret to getting good scores. 48-0 is a great score but there's much better ones out there on youtube.
Some weapons work better than others but simply using a certail loudout doesn't guarantee anything.
Most of the time it's just get on the good side of the connections and vs. a team that's complete and utter garbage.
Quoted for truth. I'm sure there are people out there that can manage 50-0 or better with a Surpressed M1216 or the 5-7. Different stuff works well for different people. --- Proud to be a farm animal until someone tells me otherwise.
Good players aren't good because of the guns, attachments, perks, etc. they use. Players are good because of map knowledge, reactions, aim, general understanding of the game and how it works. Connection also plays a factor, but it does not make a person skillful, just gives an advantage. --- GT: Stelthmastr