I have a 4 port, angled muzzle brake for sale threaded 9/16 x 24 with an outside diameter of 0.750" tapered down to 0.635". Should blend nicely with a sporter weight barrel with minimal blending required. I will take $45 shipped for it.

What caliber or does it need reamed

I think it's bored out for a 7mm.

Bump up for a great deal on a nice muzzle brake.