Calico M-100 S chambered in .22 LR. This model is a thumbhole wooden-stocked M100S with the "S" standing for "Sporter," a semi-auto .22 LR carbine manufactured between 1989 and 1994. The M100 is a blowback-operated semi-automatic rifle chambered in .22 LR, manufactured by Calico Light Weapons Systems in Elgin, Oregon. It was originally designed and released in the 1980s. With a 100 round high capacity helical-fed magazine mounted on top of the weapon. With the original user manual and shipping foam and box. Located in Nampa Text 208-880-8450