FS: Stainless Radial Brake from Christensen Arms. New 5/8 x 24 threading for .30 caliber and above
Made to fit a .920 bull barrel diameter. Just received it with a 300 ridgeline & won't be using it. $100 to your door.
Im not the seller but I just bought a Cristensen Arms MPR and it did not come with a thread protector. They told me that all of theirs are threaded the same so as long as it is the same they fit. So since they are both .30 cal it should fit. I would still call Christensen Arms before buying.