A muzzle brake for dissipating a recoil force created by the discharge of a firearm having a muzzle, without a substantially increasing the noise heard by the shooter. To fit these bar units together, coupling elements in the form of cylindrical pins provided with passages are provided, which are provided with recesses having sloping planes which are engaged by the conical tips of Allen screws and thus produce a clamping together of adjacent bar units. The error correction circuit is activated by the write data input instruction signal to receive the write data in synchronization with the write enable signal, and is activated by the write instruction signal to generate a check data for an error correction in synchronization with the control signal. A spring is carried inside the hollow body and hollow plunger, the lower end of the spring seating against a webbing formed in the transparent tip and the upper end seating against the upper end of the plunger.