T2 Terminator muzzle brakes are designed for ..223 to 338 Lapua Magnums on barrels up to 21mm diameter. Standard hole size 6mm, must be opened up to correct calibre by a Gunsmith.
All brakes have flats for a spanner and so they can be easily fitted by the gunsmith.
The ports are 90 degrees to the ground to reduce ground disturbance and are angled back away from the shooter to minimise shooter discomfort and maximise performance.
The through hole requires opening up to 0.025-0.030" over calibre size and it is recommended the rear of the brake be tapered down to the muzzle diameter.