| 摘要 |
This invention provides a projectile assembly (10) having a body part (14) including a trailing portion (19) which reduces in diameter rearwardly and supports a sealing band (16) having a substantially cylindrical outer face for engagement with the bore (21) of the barrel (11). The body part (14) may move rearwardly through the sealing band (16) to expand it outwardly into sealing engagement with the bore (21). Upon firing the body part (14) moves forwardly relative to the sealing band (16) to free it from the bore (21).
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