badger thruster brake here...3 gills...simple, extremely effective on my savage 10 308...feels like a frigging 22...im not kidding, then again, my rifle is heavy as heck and its not lound at all....however, it was not very friendly to my range buddy shooting prone next to me...hard to concencrate with the concussion waves, but its expected...its not very loud either, really felt like a normal 308 to me, didint need any additional hearing protection...casey brower from tacord stocks them