, s/n 4512xx K31 modifications history 1934 The firing pin was lightened. 5x55mm Swiss Gewehrpatrone 1911 (GP11) that was the standard issue rifle of the Swiss Armed Forces from 1933 through 1958. The wooden grip is an example of the early post war Carbine bayonet and it comes with a M8 style scabbard. The Swiss K31 Bayonet has an impressive double-edged blade and is impressive stand alone as a short sword or will look great mounted to your rifle. These include the original issue blued steel scabbard. Surplus - Unissued condition! No serial numbers stamped into hilt. Wood grips with patina on the handle and crossguard. It was never issued to a rifle and therefore not serial numbered.