I believe that the SA80 is possably the best gun on the game for single shot at a Target (TANGO) between 30-80 M. Automatic for assulting a position of a Tango or Check point (CP) but not effective against most types of shotgun, with the pump-action 50/50 if you sidestep out of it.
If you wanna spray brass into someone then go for the G36E also a medic weapon i believe that on rapid /3 between 30-60 M. single shot i wouldnt waist my time as in aimed shot obscures most of your short range vision.
Assulting the position
Tactal Maneuvers These subjucts i will cover in the near future
Contacts With video clips to help.
Squads
Patroling
Good Luck Hunting
