Several years ago I bought the pictured brake from boysatr50.com it is a clamshell mini 50 brake for a light 338 RUM hunting rifle and it is amazing reduces recoil 70% makes a light 338 RUM kick less than a .243 bolt gun. They have retired and. Losed down an cannot find anybody making it. There are no holes on yop the way I like it for low light or at night and ports are angled back. Works fantastic jyst dont stand beside it.