| 摘要 |
<p>A forward elongated body section has a depending scraper extending radially outward to contact the inner wall of the tube as the projectile is propelled through. The scraper is resilient radially so that the scraper can pass through the internal sleeve and over dents in the tube. The end section comprises a resilient annulus having an integral, rearwardly and outwardly extending skirt, and two rigid annular discs, each abutting opposite sides of the resilient annulus. A rearward axial extension from the body section, has a diameter less than that of the body and an axial bore and a terminal crimp. The axial extension passes through the resilient annulus and the annular discs such that the terminal section is returned on the axial extension between the body section and the terminal crimp.</p> |
