From Rodriguez v. Glock, Inc., 28 F. Supp. 2d 1064 (N.D. Ill. 1998): “According to the testimony Plaintiff submits, including Bedoya’s testimony from his criminal trial, Rodriguez grabbed Bedoya from behind, held his arm and attempted to remove Bedoya’s service revolver, a .40 caliber Glock Model 22 semi-automatic pistol, from its holster.” The Glock 22 is a semi-automatic pistol, not a revolver, but more to the point nothing can be both a semi-automatic pistol and a revolver (except perhaps under very odd
and to my knowledge entirely hypothetical circumstances [UPDATE: some commenters pointed out that there were indeed some very rare guns that were both]).
Incidentally, a quick Google Books search for Glock revolver yielded an alarming number of hits. (To my knowledge, Glock doesn’t make revolvers.)