I like dual wielding pistols because it doesn't obscure the center of the screen, but my ability to inflict headshots seems to suffer. What exactly does having two pistols out at the same time do? Is there a hard accuracy penalty for dual wielding, or do I just need to learn to aim without iron sights? Are there any other obscure effects dual wielding provides?
From the Killing Floor wiki:
There was a bug that caused the off-hand 9mm pistol to fire inaccurately depending on the direction the player was facing, however this has been fixed in patch 1054.