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I put one on a rock river coyote upper that was 20". It had a vortex hider on it before. I did notice a difference in sound. Maybe it is just a different sound and not a more quiet-to-the-shooter one, but it didn't ring my ears. I have a 22" .20 tactical and with my buddy and I shooting both, the linear compensator rifle was more pleasant to shoot for sure. Joebobs just got in some Kies linear comps today and I ordered two more. I would recommend the Kies over the levang. Kies has wrench flats on it for secure installation and appears to be back bored in the front further which can't hurt. The levang I installed required a pipe wrench due to the lack of wrench flats. I scarred the heck out of it and had to hand sand out the marks then paint it. Not the best way, but I heard enough about them coming off that I thought tighter was better. With wrench flats, the Kies should be as secure as any muzzle brake.