Muzzle brake for firearm

Abstract

A muzzle brake for a firearm includes ports bored or otherwise formed into side surfaces of the muzzle brake. The ports may be formed such that a central axis of each port may be present at an angle that is rearward of perpendicular to the through bore. In this manner, the exhaust opening of each port at the muzzle brake side surface is rearward of the intake opening that connects with the through bore. The ports are located in horizontally and symmetrically opposed pairs, one port in each pair extending through a sidewall on opposite sides of a vertical central plane of the muzzle brake. Each port may comprise two parallel bores. A centerline of each boar is tangent to the diameter of the through bore. The bottom of each port bore has a spherical surface 140. This spheroid termination into the through bore and incidental intersection with adjacent ports results acute angles at each edge leading away from the through bore and into the ports.

We claim: 
     
         1 . A muzzle brake for a firearm compromising:
 a rearward end that attaches to the barrel of a firearm;   a forward end;   a through bore that extends from the rearward end to the forward end along an axis of the muzzle brake;   an outer surface comprising a first side surface and a second side surface;   a first port extending from an exhaust opening at the first side surface to an intake opening at the through bore, wherein a central axis of the first port is formed at an angle that is rearward of perpendicular to an axis of the through bore such that the exhaust opening is rearward of the intake opening.   
     
     
         2 . The muzzle brake of  claim 1  wherein the angle is between 10 and 25 degrees rearward of perpendicular to the axis of the through bore. 
     
     
         3 . The muzzle brake of  claim 1  wherein an intersection between a sidewall of the first port and a sidewall of the through bore form an acute angle. 
     
     
         4 . The muzzle brake of  claim 1  wherein a diameter of the first port is greater than a diameter of the through bore. 
     
     
         5 . The muzzle brake of  claim 1  further comprising a second port, the second port comprising a central axis extending parallel to the central axis of the first port. 
     
     
         6 . The muzzle brake of  claim 5  wherein a diameter of the first and second ports is larger than the distance between the central axes the ports such that the ports intersect. 
     
     
         7 . The muzzle brake of  claim 6  wherein the central axis of the first port is tangent to a diameter of the through bore on a first side and the central axis of the second port is tangent to a diameter of the through bore on a second side. 
     
     
         8 . The muzzle brake of  claim 5  further comprising a third port extending from an exhaust opening at the second side surface to an intake opening at the through bore. 
     
     
         9 . The muzzle brake of  claim 5  further comprising a fourth port extending through the second side surface, wherein the first and second ports form a first port pair extending through the first side surface and the third and fourth ports form a second port pair extending through the second side surface. 
     
     
         10 . The muzzle brake of  claim 9  wherein the first port pair and second port pair are horizontally opposed. 
     
     
         11 . The muzzle brake of  claim 5  wherein a termination of the first port extends beyond the axis of the through bore and a termination of the third port extends beyond the axis of the through bore such that a terminal surface of the first port intersects with a terminal surface of the third port. 
     
     
         12 . The muzzle brake of  claim 11  wherein at least a portion of the first port terminal surface comprises a spherical shape. 
     
     
         13 . The muzzle brake of  claim 12  wherein a sidewall of the first port intersects with a sidewall of the second port forming an acute angle between the inside surface of the first port and an inside surface of the second port. 
     
     
         14 . The muzzle brake of  claim 13  wherein at least a portion of the third port terminal surface comprises a spherical shape such that the first port and the third port intersect forming an acute angle between an inside surface of the first port terminal surface and an inside surface of the third port terminal surface. 
     
     
         15 . The muzzle brake of  claim 1  wherein at least a portion of the outer surface comprises a cylindrically shaped surface. 
     
     
         16 . The buffer assembly of  claim 15  wherein the cylindrically shaped portion of the outer surface comprises a first section having a first diameter and a second section having a second diameter that is smaller than the first diameter. 
     
     
         17 . A muzzle brake for a firearm compromising:
 a rearward end that attaches to the barrel of a firearm;   a forward end;   a through bore that extends from the rearward end to the forward end along an axis of the muzzle brake;   an outer surface comprising a first side surface and a second side surface;   a first port comprising a central axis and extending from an exhaust opening at the first side surface to an intake opening at the through bore;   a second port comprising a central axis that extends parallel to the central axis of the first port   wherein a diameter of the first and second ports is larger than the distance between the central axes the ports such that the ports intersect.   
     
     
         18 . The muzzle brake of  claim 17  wherein the central axis of the first port is formed at an angle that is rearward of perpendicular to an axis of the through bore such that the exhaust opening is rearward of the intake opening. 
     
     
         19 . The muzzle brake of  claim 17  wherein the first and second side surfaces are lateral side surfaces and the outer surface further comprises a top surface and a bottom surface. 
     
     
         20 . The muzzle brake of  claim 19  wherein the first and second side surfaces comprise substantially cylindrically shaped surfaces and the top and bottom surfaces comprise substantially planar surfaces.