This horse has probably been beaten to death already, but I'll just add that I JB welded the JoeKen muzzle brake onto my 20" Saiga barrel and have experienced no problems so far. I've put a couple hundred rounds through it since then, and careful inspection afterwards indicates no loosening or cracking of the joint. I did not shoot rapid fire, however, because I was also sighting in my POSP scope at the time.
FWIW, here's how I did it:
1) The ID of the brake was a little larger than the OD of the barrel, so I needed something to build up the small gap between the barrel and brake. I di