Patent ID: 7210260
Filing Date: 2007-05-01
Classification: F41A,F42B

Abstract:
1. A gun chamber for firing a case-less projectile, comprising: a base; a relatively straight-walled body portion extending from the base defining a generally cylindrical body cavity having a body diameter; a shoulder portion connected to the relatively straight-walled body portion at a body-to-shoulder junction; a neck portion defining a neck cavity and having a neck diameter which defines a ratio of the body diameter to the neck diameter which is in the range from about 1.8:1 to 2.3:1, wherein the neck diameter is sized to accommodate a case-less projectile at least partially nested therein, wherein the chamber is sized and configured to contain a sufficient quantity of propellant such that igniting the propellant causes formation of a propellant plug having a diameter that is approximately the interior neck diameter, and wherein the shoulder is connected to the neck at an angle of approximately 40 degrees or more which causes the propellant plug to shear free from unburned propellant that is disposed adjacent the relatively straight-walled body portion.