One spanner on the nut ,one on the Brake, loosen them from each other then just screw them off and put on the new Brake. I used an o-ring against the shoulder of the barrel to snub the brake up to. Easy to locate top dead center for the brake and never had a problem with it moving. Just tighten down one full turn after contacting the O-Ring with the brake for firm fit. I replace the O-Ring occasionally if I think the old one has crushed a bit and is in danger of letting the brake move but other than that just a bit of gun oil on the thread, on with the brake, Locate it at TDC and ya good to go.Was eyeing one of the bigger RPRs the other day in 300PRC. But that beast of a muzzle break is an eyesore--how hard is it to get them off and changed? Is it just loctited or rockset on? The "Poors" rifle thread had me thinking this might be a decent project gun to upgrade as I go and I really like my Ruger Precision 22 (very similar).