Patent ID: 8074391

Claim:
A firearm formed by a housing, in which an assembly of a carriage and a barrel with a muzzle brake, and a breech block are slidingly supported, wherein the breech block is equipped with a return spring that is supported on a rear support surface of the housing, comprising: a counter weight being slidingly disposed in a longitudinal space located between the housing and the carriage, the support surface of the counter weight leaning against a rear end of the return spring, the counter weight being seated in a front position thereof on a first front stop surface of the carriage, the breach block being seated in a rear position thereof on a rear stop surface of the carriage, a front end of the return spring leaning against a front support surface of the housing at the front end in the front position of the breech block, whereby a transfer element protrudes into the path of the breech block, the transfer element being simultaneously supported on the carriage and on the counter weight, and in an outer position thereof pushing the counter weight against a second front stop surface of the carriage.