Patent ID: 7568420
Filing Date: 2009-08-04
Classification: F41A,F41C

Abstract:
1. A muzzle lift cancellation apparatus for a firearm having a given center of mass, the firearm having a frame supporting a barrel, a grip attached to the frame, the barrel having a barrel wall surrounding a bore extending along a longitudinal axis between a breach end bore opening and a muzzle end bore opening, and having a structure for supporting, at an ignition location proximal to the breach end bore opening of the barrel, a projectile and a propellant for the projectile, and having a trigger mechanism for selectively igniting the propellant to form an expanding propellant gas having a given compression wave front urging the projectile and applying a given associated torque moment to the firearm about the given center of mass, the apparatus comprising: a vent port extending through the barrel wall to the bore; a gas conduit extending from the vent port to an occluding structure having a compression wave front impinging surface below the longitudinal axis of the bore and below the center of mass of the firearm, wherein the occluding structure and the conduit form a substantially closed chamber wherein the vent port, the gas conduit and the compression wave front impinging surface are arranged to guide a portion of the compression wave front from the bore to strike the compression wave front impinging surface to impart a given counter torque moment on the firearm counteracting the given associated torque moment applied by the compression wave front urging the projectile.