Country of origin

United States


US Armament Corporation


John P. Foote

Weapon type

Automatic shotgun


12 gauge, 20 gauge (prototypes only)



  • 12 gauge: 9.5 pounds (4.31 kilograms)
  • 20 gauge: 6.7 pounds (3.04 kilograms)
Magazine/Cylinder capacity

10-round detachable box magazine

The FAS-173 is a gas-operated fully automatic shotgun. It is chambered in 12 gauge, with early prototypes chambered in 20 gauge. This firearm was designed initially to compete with the AA-12.


The FAS-173 was designed by John Foote, who based it on an assault rifle he had built based on the AK series.

Design detailsEdit

The FAS-173 is gas-operated, utilizing a long-stroke piston gas system. It is almost built entirely of steel, while prototype 20 gauge versions have steel-lined aluminum barrels. It uses a gas system similar to that on an AK-styled rifle. The weapon has a wood stock, though plastic stocks and side-folding stocks are also available. While the weapon's designation is similar to the FAC-70 which Foote himself also designed, the weapon resembles the older R68 much more.


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