MT61168 - Tri-Rail Barrel Mount
Tri-rail mount for adding Picatinny rails to a rifle or shotgun that does not have a rail. Easily clamps on any barrel, from 12mm to 24mm diameter. Includes 12 different length screws to adapt the mount to the barrel diameter. Fits anything from a 10mm to 22mm. 40mm long (front to back), 55mm wide (two rail sides), height will depend upon what diameter barrel it is mounted on.