If you plan to build your own AR-15, and you don't intend to use any specialized type of muzzle device, then the Aero Precision AR15 A2 Birdcage Flash Hider is a good direction in which to head. While it won't outright beat out any specialized muzzle device at any particular job, it's a design that's been proven with time as a jack of all trades. It helps hide your flash. It mitigates enough recoil for you to control your aim. It reduces muzzle rise enough for you to keep your aim level. All around, it's a solid choice for a muzzle device, and that's why it's been the standard, the mil-spec design for so many years.
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
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