The Collaborative International Dictionary of English v.0.48:

Pistol \Pis"tol\, v. t. [imp. & p. p. Pistoled; p. pr. & vb.
   n. Pistoling.] [Cf. F. pistoler.]
   To shoot with a pistol. "To pistol a poacher." --Sydney
   Smith.
   [1913 Webster]