Those nice folks out by Schriever had one of these I put on my AR. Have yet to shoot it but was impressed by their testing video and the fit and finish of the brake.
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I have one of the brakes, and helped them do some testing but haven't seen the video, got a link?
As a side note, I have a collection of brakes but this is the one that is on my rifle...... take that for what it's worth. THIS BRAKE WORKS!