Ok, so I have never had anything with a threaded barrel nor have I ever really looked very closely at anything with a muzzle brake. I just bought a rifle that has a threaded barrel, and just happen to have a muzzle brake with the same threads. Don't even remember where it came from. But my question is, I see that most new muzzle brakes come with either a crush washer or jamb nut of some sort. I don't have either and can't seem to find either locally. Are these truly required? I can order one online, but it's killing me to have a shiny brand new gun just sitting there staring at me. While I could go out and shoot it without the muzzle brake, I'd prefer to not have to sight it in twice. Just hoping someone has some useful tips, ideas, or suggestions.