|Place of origin||United States|
|Manufacturer||Calico Light Weapons Systems|
|Mass||3.7 lb unloaded|
|Barrel length||16 inches|
|Rate of fire||Semi-automatic|
|Muzzle velocity||1400 ft/s|
|Effective firing range||100 yards|
|Feed system||50- or 100-round magazine|
The M100 is a blowback-operated semi-automatic rifle chambered in .22 LR, manufactured by Calico Light Weapons Systems in Elgin, Oregon, United States. It was originally designed and released in the 1980s to be of use to law enforcement and military markets due to its slim profile.
Calico M100s were used to portray futuristic space weapons in the 1987 science fiction parody film Spaceballs. Calico M100s were also featured in the 2000 survival horror game Resident Evil Code: Veronica
Possessing a unique 100-round helical-fed magazine mounted on top of the weapon, the introduction of the Federal assault weapons ban made manufacture of the Calico family of weapons for sale to civilians illegal, until the legislation expired on September 13, 2004, in accordance with its sunset provision.
The company is now allowed to build the exotic firearms in their original configuration.