Pistol weapons are similar to rapid fire weapons but are light enough to be carried and fired one-handed. As they are lighter they often have a less powerful charge that limits their range. On the plus side they allow a trooper to fight in close combat with a combination of pistol and sword, axe or other close combat weapon.
If a model armed with a pistol moves it can shoot once at targets up to 12" away.
If a model armed with a pistol weapon remains stationary it can shoot twice at targets up to 12". NOTE: If you fire your pistol twice, you may not assault afterwards.