Hello all, I have a question I was hoping someone could answer. I'm having my .300 Win Mag rebarrelled with a Shilen #4 contour barrel that is .650" at the muzzle. I sent an email to Center Shot rifles asking if the standard muscle brake would work because I like the slab sided look. He said it would not and I need a CSR brake. I want to know if the CSR brake is ported the same as the muscle brake. In other words, is the first port the 90 deg and the others slanted forward?