Yeah, staying away from Hardcore. Full of tryhard campers, more than usual.
ACOG on the M27 seems to help, already on my way to the last headshot camo. --- Not removing this until Dr. Dre's Detox album is out. 11/22/08 THOU ART THEE ART THOU STICK THY HAND IN TV, DO IT DO IT DO IT DO IT DO IT!
I feel like this gets asked and answered at least twice a day, but...
Red dot sight plus tacticals. In past CoDs I partied up with some others who were on the same headshot challenges, and we would toss mass concussions and 90% of the kills each match were headshots. You probably want a sight, take your pick. Especially effective against randoms.