When trying to use a pistol (tested with Magnum and 1911 so far) the gun will not aim or fire. When selected and in prone, nothing happens when I right click to aim or space to raise weapon. When crouched or standing, right clicking changes to a zoomed in view but I'm not holding the gun. I can't fire in any stance. Right clicking the gun in inventory doesn't show any options to unload etc.
I couldn't get the magnum to work at all but I gave it to another player and it worked for them. They gave me their 1911 and I experienced the same problem with the second pistol.
Video showing problem: http://youtu.be/CfcKdpu047Q