Firing mechanism

A firing mechanism for a firearm which comprises a body (10) in which there is a cavity (14) for a round of ammunition with a percussion detonating means in a rearward facing surface thereof, at least one transverse aperture (15) for introduction of a round into the cavity and ejection of the round therefrom, a breech block (25) rearward of the cavity and movable from a rest disposition to a firing disposition forward of the rest disposition to carry the front of the round forwardly into engagement with a seating (20) at the forward end of the cavity, a firing pin (26) carried by the breech block (25) with a forward end to impact with the detonating means for detonation and discharge of the round, and a trigger (41) to actuate the movement of the breech block and the firing pin, the firing mechanism comprising means to transmit the trigger movement to the breech block and lock the breech block in the firing disposition, and being characterised by camming means (45) caused to move from a rest disposition to a firing disposition by movement of the trigger (41), the camming means (45) having a first camming surface (48) which contacts a cammed surface (49) on the breech block (25) to urge the breech block from its rest disposition to its firing disposition and lock the block (25) in the firing disposition until the trigger (41) moves out of its firing disposition, and a second camming surface (60) which contacts a cammed surface (61) on the firing pin during movement of the camming means (45) from its rest disposition to its firing disposition to restrain forward travel of the firing pin during said movement yet allow such forward travel, for actuation of the detonating means, once the breech block (25) is locked in the firing disposition.