Apparatus for increasing the rate of fire in automatic weapons

An apparatus for increasing the rate of fire of an automatic weapon comprising:

• a breech mechanism controlled by means of recoil movements arising in the breech of the weapon on its discharge, and by an operating cam and a spring member included in the breech mechanism;
• case ejectors for arresting a breech block in the total recoil position of the breech, and holding said breech block in the open position for the subsequent ramming of a new round, said case ejectors being exposable, in the arrest position of the breech block, to a new round in its ramming cycle, said ejectors accompanying the new round and releasing the breech block to be unrestrained for actuation by said spring member towards its closed position, and said operating cam being movably disposed at least when the breech is in the total recoil position, so that said spring member begins actuation of said breech block in its movement towards the arrest position independently of the configuration of the cam and at an earlier stage than total recoil position of the breech, wherein a mounting device of said operating cam is provided with a guiding surface which cooperates with a position fixing member, said guiding surface having a chamfer which facilitates guiding of said position fixing member when the breech executes its recuperation movement from total recoil position.