Assault Rifles: Commando (used in TDM)
Sniper: L96A1w/ variable zoom
Sub-Machine: Ak74u with silencer and rapid fire (I use most of the time)
Light-Machine Guns: Stoner (almost never used)
Shotguns: Spas-12 (used on nuketown and in camping spots)
Pistols: Python Duel Wield
ak74u
M14
Porters x2 ray gun and zuse cannon
use the ray gun or the thunder gun
the enfield and aug
the thunder gun and hk21 are the best on black ops
famas
Try to use the MP5K.
disco stick
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Just do u best that's all i can say :-]
for me it's so far the Olympia or Stakeout (both shotguns) but people have different "best" guns on black ops wii