 CONT: SPOILER: The type of pistol Bourne holds against Dr. Hirschs  head near the end of the movie changes. In shots over Bournes  shoulder prior to the complete flashback (showing Dr. Hirsch) the  pistol is a Glock. In shots over Hirschs shoulder (showing Bourne)  the pistol is a Sig Pro, as revealed in Vosens office. Following  the complete flashback, the pistol is a Sig Pro both in shots  showing Bourne and in the reverse.