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You are talking about the 6mm Vais.
George Vais developed the 224 and 6mm Vais along with his muzzlebrake in the late 90's. He retired and sold his business to Ron Barlett. You can check out some articles on Ron's website.
http://www.muzzlebrakes.com/articles.htm
I have a 6mm Vais and can shoot the 107's at 3200fps without pushing hard.
George Vais developed the 224 and 6mm Vais along with his muzzlebrake in the late 90's. He retired and sold his business to Ron Barlett. You can check out some articles on Ron's website.
http://www.muzzlebrakes.com/articles.htm
I have a 6mm Vais and can shoot the 107's at 3200fps without pushing hard.