Abstract: A stabilizer, for firearms which fire a single projectile from each shell, which is attached to the muzzle of the firearm to control muzzle climb during firing. The stabilizer is adjustable in both the magnitude and direction of the forces which counter muzzle climb. The stabilizer is able to be adjusted for the individual characteristics of the firer as well as varying powder loads in ammunition. A body of the stabilizer is attachable to the muzzle of the firearm so that gas vent slots and gas screen ports may be oriented from the vertical in any desired direction. An adjustable nose cap is threaded into the body any desired portion of the length of the body and the nose cap may cover or expose any of the gas vent slots or a portion of one of the gas vent slots thus controlling the space through which escaping gases may escape, and consequently controlling the magnitude of the force countering the muzzle climb.