I have for sale a brand new Straight Shot Gunsmithing V Port Vaporizer Muzzle Brake
. It is 7/8" diameter with four 3/16" "V" ports that are angled at 10 degrees. The brake tapers to 0.665" to where it would contact the barrel and is threaded 1/2 X 28 tpi. It is set up for use with a 7mm caliber bullet. I will sell it for $90 shipped.