T3 Terminator Muzzle BrakeT3 Terminator muzzle brakes are designed for . 223 to 338 Magnum cartridges on barrels up to 25mm diameter. The standard T3 threads are x 28, 9 16 x 24 & 28, 5 8 x 24, 28 & 32, M14, 15, 16, 17, 18, 20 x 1, 11 16 x 24, x 24 & 28 The T3 doesnt have a top or bottom, it has flats for a 23mm, 15 16 spanner and a small indexing mark so they can easily be fitted by a Gunsmith. Ports are 90 degrees to the ground to minimise debris disturbance The ports are