The Bravo Company A2X Flash Hider is an extended version of the A2 flash hider "Birdcage" found on the AR-15 family of rifles. Threaded in 1/2"x28 for .223/5.56 rifle barrels. Machined from 4150 steel and Phosphate coated per Mil-Spec. This Flash Hider is meant to bring a 14.5" M4 barrel to a non-NFA length of over 16.1" when permanently installed. The A2X comes predrilled with a hole at the base for permanent installation as well as a dowel pin and crush washer. Installation should be done by a qualified gunsmith familiar with BATF regulations.