Patent ID: 8752319
Filing Date: 2014-06-17
Classification: F41A,F41C

Abstract:
1. In a projectile launching device having a frame carrying a barrel and a projectile feed mechanism configured to hold and sequentially align a projectile therein with a rear portion of the barrel, the improvement comprising: a) a sliding sleeve positioned over an inner end portion of the barrel, said inner end portion of the barrel and an inner diameter of the sliding sleeve closely mated; and, b) said sliding sleeve having a front face having a central opening therethrough having an inner diameter nominally equivalent to marginally larger than, a bore through the barrel; whereafter firing, the sliding sleeve is instantaneously driven back, substantially by gas pressure, until the front face of the sliding sleeve makes contact with the feed mechanism, thereby eliminating any gap between the feed mechanism and the barrel, preventing gas from escaping therethrough, and substantially increasing projectile discharge velocity and energy, and subsequently, after the projectile is fully discharged, and gas pressure drops, said sliding sleeve is no longer forcibly maintained in a gap eliminating position.