Patent ID: 7793455

Claim:
The combination of: a rifle barrel extending from a breech end to a muzzle end and having a bore extending from the muzzle end to an inward shoulder proximate the breech end, and an internally threaded breech cavity disposed between the inward shoulder and the breech end, the internal threads having inward peaks defining an inner diameter of the breech cavity greater than the minimum diameter of said rifle barrel; and a nozzle for lubricating only the internally threaded breech cavity of said rifle barrel, said nozzle including an inlet portion with an inlet opening having a surface adapted to receive a fitting of a lubricant container, such that lubricant expelled from said container flows substantially only into the inlet opening, an end portion having an outer cylindrical wall extending from the inlet portion to a closed end and perforated by a plurality of lubricant apertures, and a lubricant passage extending from the inlet opening to the closed end and connecting with each of the lubricant apertures formed through the outer cylindrical wall of the end portion, wherein the lubricant apertures are disposed along the outer cylindrical wall of the end portion such that, when the end portion of said nozzle is inserted into the internally threaded breech cavity of said rifle barrel, the lubricant apertures of said nozzle are registered only with the internal threads of the internally threaded breech cavity of said rifle barrel, the outer cylindrical wall having an outer diameter selected to closely fit within the inner diameter of the internally threaded breech cavity of said rifle barrel and having a length selected such that when the closed end contacts the inward shoulder of said rifle barrel, the lubricant aperture furthest from the closed end of said nozzle is adjacent to the internal threads of said rifle barrel.