You can find the Troy Medieval Muzzle Brake 5.56 here Fast $9.95 shipping! Orders over $200 ship for free!

The Troy Medieval Muzzle Brake for AR-15 has enhances control and accuracy during when firing full auto or rapid semi-auto fire. The aggressive diamond-shaped teeth on the end of the muzzle device can serve as a breaching device for use in close quarter battle. Machined from a heat-treated ordnance steel construction.

Caliber: 5.56/.223 1/2x28 TPI
Length: 2.25"