Check out Midway, assuming you have a 5/8 X 24 treaded barrel, get a 5/8X24 brake for an AR 10, they work great.
Timing is nothing more then getting the ports lined up where you get no lateral movement when you fire. Not that difficult.
Sure brakes are hard on the ears, thats why they make ear protection which you should be using anyway, as well as the people around you when you shoot.
I'm a fan of Brakes, I put one on my Model 70 375 H&H, it now kicks less then my model 70 257 Featherweights.
You cut down on punishing recoil, you're gonna shoot better.
Besides my 6.5 RAP, I also put a brake on my 223 & 204 Ruger RAP. That 204 doesnt wiggle when you shoot. You can see your hits on prairie dogs. I have a Ruger #1 in 204 w/out a brake, you'd be supprised the difference even though the #1 is heavier.