A gun barrel having a rifled-bore section at the breech end thereof and a smooth-bore section at the muzzle end thereof, the sections having a gas tight connection therebetween, the rifled-bore section comprising a first generally tubular body having a longitudinal bore and at least one spiral...
The extension has a rib 51 which serves as a sight for the gun when a bead sight 49 of the latter is received in a groove 52 formed by the rib 51. The bore 31, Fig. 1, of the extension 10 is in alignment with the bore 12 of the barrel 11. In a modification shown in Fig....