Got a new rifle today from a friend just returning from Africa. He was a professional game guide. It is a .375 H&H Magnum, Sako AV with a 1.5 to 6 Karl Kahles scope. It has some custom gun smith work done on the rifle. The end of the barrel is threaded and it comes with a removable muzzle break. When Target shooting and sighting in the rifle You can screw on the break, but when hunting, take it off and screw on a thread cap.