The Best Muzzle Brake Ever - AR15
This Precision Armament M4-72 Severe Duty is my favorite muzzle brake available on the market. Yes it's expensive for a muzzle brake, but damn if it ain't do the job of keeping your rifle shooting flat as hell!
Check out this in depth review on many different muzzle brakes and their effectiveness. The M4-72 Sever Duty from Precision Armament easily takes the cake.
CAUTION: It makes your rifle loud as fuck. To not annoy people on the range next to you, you should clock this muzzle brakes 12 o'clock position to the 1 o'clock which will direct blast up and left/ down and right. This will also help the recoil drive into your support hand if you're a right handed shooter. Left handers should do the opposite.