| 摘要 |
A cartridge holder for fitting into the breech of an ejection release unit comprises a generally cup-shaped body formed of two parts, one of which forms the base of the cup and the other of which forms a continuous cylindrical wall for the cup which fits into the base part. The base part has an external screw thread for engagement with the screw thread in the breech opening and the engaging surfaces of the two parts are shaped in relation to one another so as to define passages extending between the interior of the base part and the exterior above the screw thread, this preferably being achieved by forming the outer surface of the cylindrical part with a number of spaced longitudinal lands extending over the length of the surface engagement co-operating with a smooth and cylindrical inner surface on the base part.
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