Patent ID: 9441901
Filing Date: 2016-09-13
CPC Classification: F41A

Claim Text:
1. A muzzle brake for stabilizing the muzzle end of a firearm barrel and reducing felt recoil of the firearm, wherein a firearm muzzle bore has an inner diameter, said muzzle brake comprising: an inner tube having a cylindrical wall, an outer diameter, a proximal end, a distal end, a circumferential inner surface at the proximal end, and circumferential outer surface at the proximal end, said inner tube having a plurality of exhaust ports penetrating through the cylindrical wall of said inner tube; and an outer shield tube having an inner diameter that is larger than the outer diameter of said inner tube, said outer shield tube being coaxially mountable relative to said inner tube, said outer shield tube comprising a metal tube, and said outer shield tube further having a proximal end, a distal end, a circumferential outer surface at its proximal end, and a circumferential inner surface at its proximal end; said inner tube further having an inner bore having a proximal end and a distal end, said inner tube bore being open to the atmosphere at its distal end, said inner tube bore having a diameter that is larger than a diameter of a projectile that passes therethrough; said distal end of said inner tube extends beyond the distal end of said outer shield tube when said outer shield tube is coaxially mounted to said inner tube, such that a fractional portion of some of said plurality of exhaust ports located closest to the distal end of said inner tube are not wholly enclosed by said outer shield tube; said inner tube further comprising a flange at its proximal end that effects a sealing engagement with the circumferential proximal inner surface of said outer shield tube; and said outer shield tube and said inner tube defining a gas expansion chamber therebetween, said gas expansion chamber being formed as a space between the outer surface of said inner tube and the inner surface of said outer shield tube, wherein a transverse cross-sectional surface area of said gas expansion chamber is at least two times larger than a coplanar cross-sectional surface area of said inner tube bore.