My take on the Accatran laspistol from warhammer 40k,
The Laspistol is the pistol version of the Lasgun and like that weapon fires a coherent beam of energetic photons that can burn through most materials. The Laspistol is powered by a miniature power pack that is usually placed within the grip. The Laspistol is used most often by officers or Commissars of the Imperial Guard in conjunction with a close combat weapon, often a Chainsword or Power Sword. The Laspistol was specifically intended to allow the user to fire one-handed and wield a melee weapon in the other hand. The Laspistol is also a favoured weapon of Tech-priest Enginseers and Sanctioned Psykers.