| 摘要 |
A weapon comprises a body (6) defining a bore and a barrel assembly (5, 4, 2) slidable within the bore in a forward direction and in a rearward direction corresponding to recoil of the barrel assembly after firing. A recoil spring (13) is operable between the body and the barrel assembly to bias the barrel assembly into the forward direction. The barrel assembly comprises a barrel (5), a barrel extension (4) rearwardly from the barrel, and a breech block (2) slidably received in the barrel extension and co-operable with the barrel in a forward extremity of movement of the breech block relative to the barrel extension to define a chamber (7) within which a round (1) is fired in use. The breech block further comprises a firing mechanism (18, 19) to fire the round. A linkage (12, 9, 10, 11) connects the body, the barrel extension and the breech block, the linkage being operable to maintain the breech block in fixed relationship with the barrel during a part of a firing cycle in which the breech closes the chamber. The linkage is operable during the remainder of the firing cycle to provide differential movement between the breech block and the barrel such that the rate of movement of the breech block relative to the body is proportional to and greater than the rate of movement of the barrel extension relative to the body.
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