公开(公告)号：US06427373B1

公开(公告)日：2002-08-06

申请号：US09571151

申请日：2000-05-16

Applicant: Wil Schuemann

Inventor： Wil Schuemann

IPC: F41A2100

CPC classification number: F41A21/18

Abstract: The rifling in a barrel of a firearm is modified in proximity to the muzzle to reduce the radial difference between the land diameter and the groove diameter to urge a bullet to expand fully into the grooves and ensure rotation of the bullet about its longitudinal axis and without any lateral velocity component. Preferably, the land diameter is increased to a diameter somewhat less than the groove diameter but in the alternative the groove diameter may be reduced to a diameter somewhat more than the land diameter.

Abstract translation: 在枪口枪口的枪口在枪口附近被修改，以减小土地直径和槽直径之间的径向差异，以促使子弹完全扩展到槽中，并确保子弹围绕其纵向轴线的旋转， 任何横向速度分量。 优选地，平台直径增加到稍小于凹槽直径的直径，但是在替代方案中，凹槽直径可以减小到略大于平台直径的直径。

公开(公告)号：US5123328A

公开(公告)日：1992-06-23

申请号：US522387

申请日：1990-05-11

Applicant: Wil Schuemann

Inventor： Wil Schuemann

IPC: F41A21/28

CPC classification number: F41A21/28

Abstract: A group of upwardly directed ports disposed in a barrel of a hand held firearm intermediate the chamber and the muzzle of the firearm vent propellant gasses upwardly upon discharge of the firearm to produce a downwardly directed component of thrust to counteract gun rise and muzzle jump. Preferably, the center of the group of ports is in the vicinity of midway between the chamber and the muzzle. The ports may be straight or tapered passages or they may be nozzles.

Abstract translation: 一组向上定向的端口设置在手枪中心的手枪枪管中，枪管在火器口喷射器的枪口在枪支出射时向上流动，以产生向下的推力分量，以抵消枪升起和枪口跳跃。 优选地，所述一组端口的中心在所述腔室和所述枪口之间的中间附近。 端口可以​​是直的或锥形的通道，或者它们可以是喷嘴。

公开(公告)号：US4942801A

公开(公告)日：1990-07-24

申请号：US321898

申请日：1989-03-10

Applicant: Wil Schuemann

Inventor： Wil Schuemann

IPC: F41A21/28

CPC classification number: F41A21/28

Abstract: A group of upwardly directed ports disposed in a barrel of a hand held firearm intermediate the chamber and the muzzle of the firearm vent propellant gasses upwardly upon discharge of the firearm to produce a downwardly directed component of thrust to counteract gun rise and muzzle jump. Preferably, the center of the group of ports is in the vicinity of midway between the chamber and the muzzle. The ports may be straight or tapered passages or they may be nozzles.

Abstract translation: 一组向上定向的端口设置在手枪中心的手枪枪管中，枪管在火器口喷射器的枪口在枪支出射时向上流动，以产生向下的推力分量，以抵消枪升起和枪口跳跃。 优选地，所述一组端口的中心在所述腔室和所述枪口之间的中间附近。 端口可以​​是直的或锥形的通道，或者它们可以是喷嘴。