It is a breech loaded, dual triggered, two barrel shotgun. The shorter barrel reduces the range but gives it a larger shot dispersal, it also makes the weapon much easier to conceal and use in confined spaces. The weapon is similar to one used by Jerry Reed's character Bama McCall in the movie Gator.
In Pipeline Fever," Archer borrowed one from Woodhouse and smuggled it with him onto the plane. Upon seeing it, the sky marshall believes Archer to be a hijacker.
In "The Double Deuce," Woodhouse used twin sawed-off double barrels to protect Malory shortly after she gave birth at Reggie's Bar in Tangiers.
In "Placebo Effect," Archer uses one weapon during the interrogation of Irish mobsters involved in the sale of counterfeit cancer drugs.