For std Factory Encore rifle barrels with .725" muzzle diameter. Normally will be a 24" barrel. Note: Rifle hanger bars can be used on pistol barrels as well so long as the barrel and forend are long enough to accomodate it. In order to utilize a rifle bar on a pistol barrel the barrel must be drilled and tapped with the forward rifle forend screw hole. I can take care of drilling and tapping any additional holes needed (see "services" page for details).