Abstract: A gun capable of fully automatic firing having a trigger mechanism comprising; an arrest mechanism operable to interrupt ammunition discharging mechanism, the arrest mechanism comprising a cam element which cooperates with a complementary cam element of a timing device, and wherein the timing device comprises an electric motor operable to drive the complementary cam element when a physically displaceable trigger of the trigger mechanism is moved to a firing position and when the gun is in a fully automatic mode of operation, the timing device being operable to effect cyclical release of the discharge mechanism by said arrest mechanism.

Abstract: A fire rate control mechanism which allows an open bolt or closed bolt S.M.G. or L.M.G. to be, upon firing, momentarily arrested in a cocked condition and then to be released to fire another round after a predetermined and preset lapse of time.