| 摘要 |
A cap positioning construction for positioning and mounting a cap to a barrel, includes a triangular notch formed in a step face of a barrel on which the end of a cap abuts, and a triangular extension formed at the end of the cap. The triangular extension extends toward the notch and matches the notch 12e. By fitting the extension in the notch, the cap is positioned relative to the barrel when the cap is mounted on the barrel.
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