When we take that figure and compare it to our original 'bullet only' total, we see only 11% more recoil acceleration than this impossible scenario. If you compare that same figure with the real world total for the same rifle, the 75% efficiency muzzlebrake offers a recoil force reduction of 29.4%. By redirecting the propellant gases, the hypothetical muzzlebrake offered almost a 30% cut in recoil. Now we can also note at this time that a more precisely made muzzle- brake will let less gases out the muzzle. This would be more efficient and would give a greater degree of recoil reduction. Likewise, a less efficient muzzlebrake would give a lesser degree of recoil reduction since more of the propellant mass would continue moving forward. Muzzlebrake effectiveness is directly related to the precision of tolerances and superiority of design. A muzzlebrake has a few ten-thousandths of a second to do its job, obviously efficiency makes a big difference with such a small amount of time available. Therefore, an efficient muzzlebrake should have a lot of baffle surface and venting cross-section to achieve good efficiency. In this first KA-1830 cross-section illustration you can see the propellant paths as the bullet is passing through the muzzlebrake (propellant flow shown in blue)