of the gases the muzzle break is propelled forward with substantial force at the moment the gun is fired for this reason the muzzle break must be very securely attached to the barrel i prefer to provide the barrel with screw threads u201c t u201d and the rear of the muzzle break with matching internal threads 24 so that the muzzle break is not forced off the end of the barrel the muzzle break shown has a split collar 26 whose halves are drawn together by set screws 28 once the muzzle break has been threaded onto the barrel to prevent the muzzle break from turning on the barrel as one can see from fig5 and 6 the muzzle break is not symmetrical about a horizontal plane containing the barrel axis a greater portion of the device lies above that plane so that when the rifle is fired the gases exiting the ports have not only a substantial rearward component but also a slight upward component this pushes the end of the barrel down to compensate for the tendency of the barrel to rise or jump the exact degree of jump suppression can be altered by appropriate changes in design geometry the effectiveness.