I just noticed the M4 is pretty good, usualy im up for sniping (Yeah lots people have no idea what it is) But 50. cal in MW2 kinda sucks :P Dont like the Intervistion or wtf is called :P WA2000 is the one i think is best :P
But.. im still at lvl ..15 -.-
Just try avoid stay in close combat = Less shotties on your ass.