Indexing muzzle device w/ a jam nut

[MrB63]

Will anyone help me with the proper procedure for indexing a muzzle brake with a jam nut? Do I still need to use a crush washer or peel washer?

[Beelzy]

Nope. Just tighten the brake as far as it will go, while making sure the brake is not canted on the barrel,then tighten up the jam nut behind it. A little lok-tite on the threads will help as well.

[dfletcher]

Nope. Just tighten the brake as far as it will go, while making sure the brake is not canted on the barrel,then tighten up the jam nut behind it. A little lok-tite on the threads will help as well.

Ah - the tough part for me. Tighten, look - damn it's of. Loosen and tighten again - damn, too far.

FWIW, I put a small piece of tape on the barrel & pen mark the top center, do the same with the brake & line them up.

[Ninja45]

Hey, dfletcher,

What size jam nut did you use? where did you get it? I may need to do the same on my barrel as I cannot index the flash hider with a crush washer!

Thanks, man.

Ninja45

[ar15barrels]

Throw out the jam nut.
Index by machining or use a crush washer.

Lemme guess...
DPMS miculek comp.

I drill out the rear section on those and tap the rest of the way into the first port.

[dfletcher]

Hey, dfletcher,

What size jam nut did you use? where did you get it? I may need to do the same on my barrel as I cannot index the flash hider with a crush washer!

Thanks, man.

Ninja45

As was guessed (oops) by AR and assumed by me that you were using, mine was a Miculik comp which of course comes with the AR standard 1/2 X 28 lock nut. I suppose you could buy a thread protecter & thin it, but a peel washer is probably best.