The 9 mm Pistol was used by the Eighty-Six as a sidearm to commit suicide or euthanize their comrades to prevent their assimilation into the Legion as Black Sheep, Shepherds, or Sheepdogs. The pistol was usually kept in a holster on the Processor's right leg.
It was not officially issued by the Republic's military and it is illegal for Eighty-Six to own any firearm as they may pose a threat to the Republic, but the Eighty-Six still scavenged these pistols from old Republic military bases and used them. While the model was the standard sidearm for infantry of the old Republic, the model originated in the Alliance of Wald.
The SIG Sauer P226 (assumed model based on the anime) semi-automatic pistol is chambered in 9×19mm Parabellum (Luger) cartridge. It has a magazine capacity of 15 rounds.
- Shin's pistol was hilariously mistyped as a 99 mm automatic pistol in the official translation of Volume 2 Chapter 1. For comparison, that is 11 mm larger than the caliber of the smoothbore cannon on the XM2 Reginleif.