| 摘要 |
A gun comprising: a generally tubular barrel defining a barrel axis and havi ng an external barrel surface about the perimeter of the tubular barrel a cradle having a cradle bore for accommodating a section of the barrel wherein the barrel i s slidably mounted in the cradle bore such that the barrel can move relative t o the cradle along the barrel axis across a range of barrel positions and wherein an interface defined by the slidable contact between external barrel surface an d the cradle bore- i) prevents rotation of the barrel relative to the cradle about the barrel axis; and ii) is maintained at a single section of the cradle over th e entire range of barrel positions.
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