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There was a story that Klineguenther got his hands on some documents from WW II Arms test of various muzzle brake designs and his muzzle brake was based on one of those designs. Those documents supposedly were the source of the promotional statements used in his literature.

That literature says that there are two parts to recoil.

First is enertia from the bullet moving down the barrel. If you want to reduce recoil reduce the weight of the bullet.

The second part of recoil was described as the venturi effect, the same effect that gives a jet engine its thrust. ( I don't believe that's realy a venturi, that's not my field of science, but that's what it was called in Kliengunethers literature.) Anyway it was explained as the burst of gas expelling from the muzzle giving the rifle thrust in the opposite direction. Reduce the amount of gas expelled at the muzzle and recoil is reduced.

The theory of the muzzle brake was to interrupt the straight forward direction of the expelled gases. As the gases pass through the brake there was some forward push from the gases striking the front edge of the holes as the gas expand out the holes. But more importantly the forward gas flow was disrrupted and the amount of gas that was expelled forward out the muzzle was reduced by gass expand out sideways resulting in reduced recoil.

Sound from the shooters position was increased as described because of a change in the direction of the sonic wave. Down range the sound was descreased. In fact if you are down range from a muzzle brake it can be difficult to locate where the shot came from.

I have shot every muzzle brake that was on the market in 1989. They all worked. The Klienguether was based on the "alleged Nazi Document". The clearance or expansion chamber and diamater of the holes and count is what made the "most effective brake " from the document.

I have to admit that of the all the brakes we tested the Klienguenther was the subjectivly the most effective at reducing recoil. The angled hole ones were the least effective than the big holes models. Then came the tiny hole models with Klienguenther being the best at reducing recoil.

The ones with no hole in the bottom seem to work pretty good but they changed point of impact radically from the others. No big deal if you aren't swapping back and forth from one muzzle brake to another like we were doing.

This makes for an interesting story.

Personally I think it would be even more interesting to see if the Nazi documents relay do exist!!

We upscaled a a Klienguenther for 50 BMG chambered rifle and it worked way better than no brake and far better than the clamshell brakes a lot of people make for the big 50.

If you feel you must have a muzzle brake i sugget the one from Brockman. You can switch it off and on.

I alos thing that the only good use for a muzzle brake is ona highpowered varmint rilfe witha high magnification scope so you can see the red mist effect.

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DD, Ret.