Patent ID: 8397416

Claim:
A multi-caliber firearm comprising: a first barrel; a first breech sleeve having an inner diameter sized to accept the first barrel therein and being attached to a breech end of the first barrel, the first breech sleeve having a pair of flat surfaces extending along each side of a lower half of the first breech sleeve, the pair of surfaces forming a first angle; a receiver defining a void being sized and shaped to at least partially accept the first breech sleeve therein, the receiver defining a cut out along a lower portion, the first breech sleeve being removably attached to the receiver to expose the pair of flat surfaces of the first breech sleeve through the cutout; and a stock having a forward V-block and a rear mounting block, the forward V-block defining a V-cut along a top portion thereof and a hole substantially aligned with the cross-sectional center of the V-block, the forward V-block extending through the cutout of the receiver to mate with the pair of flat surfaces of the first breech sleeve, the first breech sleeve being fastened with the stock through the hole in the forward V-block, the receiver being fastened to the stock through the hole in the rear mounting block.