View Full Version : AR-15 How do you install muzzle brake?

03-17-2011, 2:14 PM
I'm trying to install my Yankee Hill Phantom muzzle brake onto my AR15 barrel, it's the brake with the gas ports all around except for on the bottom of the brake. When I screw the brake onto the barrel, it stops screwing in with the unported side of the brake at 11 o'clock on the barrel, correct me if I'm wrong, but isn't the unported side supposed to be at 6 o'clock on the barrel? or it doesn't matter?


I have this one, it did come with the crush washer.

Help please!

03-17-2011, 2:17 PM
If you want to keep crushing the washer by making the brake tight/loose until it fits.....hopefully the threads don't get damaged.

Pick up the peel washer (used on older rifles) and remove small sections of that washer to get the brake timed correctly.

If you want to mess with the peel washer, squash it in a vise. Or lightly file one side to remove material. Either way, you are trying to get the washer sized so that the brake bottom is coming into allignment as you tighten. If the brake is timed past where you want, you need to try another washer, work with the washer you have or use a peel washer

03-17-2011, 2:18 PM
Put the crush washer on first with the concave side facing out away from the gun (toward the muzzle). Then thread on the brake until it makes contact with the crush washer. Now with a 3/4" wrench "CRUSH" the crush washer until the brake is right side up and stop there. That's all there is to it. To crush the washer easier just go a little bit at a time and then back off. Keep doing this untli the brake is in the correct alignment.

03-17-2011, 2:18 PM
Spin tighter or file the brake.

03-17-2011, 2:24 PM
You can also sand the crush washer. I like to leave 1/4-1/2 turn left to tighten

03-17-2011, 2:25 PM
Spin tighter or file the brake.

Thanks guys for all the advice, I got it aligned, but I use alot of strength to get it there. Should I unscrew the brake to release all the pressure and re-tightened it with less pressure and add on lock-tite? or is it good?

03-17-2011, 2:28 PM
Use a clamshell type upper vice-block and a 3/4" wrench to tighten the brake to the correct position. The crush washer should be "crushed" more than a 90 degree rotation. It will take some elbow grease. It helps to tape the wrench / brake to avoid scratching it.

There are details in other threads as this has been asked/answered before. I did a search for you. Here are some links.

03-17-2011, 2:30 PM
I don't see a need for it. That pressure from the crush washer will keep it from unscrewing. I just wrenched mine on until it was aligned and left it like that. Since then, I have shot around 1200 rounds and it has shown no signs of loosening at all.

03-17-2011, 2:36 PM
Excellent, thanks for help fellas!