These brakes can be used with a crush washer or a gunsmith can properly time and blend them to your barrel diameter with a minimum of 0.675″. The outside diameter is 0.740″ x 3.000″ and internally threaded 1/2″ – 28 TPI which opens into the first port as shown in the picture.
These brakes have 2 vertical ports to help control muzzle rise and 3 large ports on the sides. There is NO porting on the bottom to help reduce dust blast.
We have done some high-speed video work of these brakes in action. These clips really show the effectiveness of the brakes at 10,000 frames per second.
Heartbraker (.300 Win Mag)
(no brake .300 Win Mag)
Inquire about quantity pricing.