Our Hex Brake is designed for and works great with the Cz858 and Vz58 family of rifles. M14x1 threaded and doesn't require a crush washer. They're made in 7.62. The brakes are also made from 316 Stainless and black nitrite coated so corrosive ammo isn't an issue!
Only 59.99 from SpectreBallistics.com.
Here's a video of it in action on a Cz858: