Spike s Tactical AR-15 A2 Flash Hider .223/5.56 Caliber 1/2x28 TPI Phosphate%u200B Features: There is nothing like a classic and in this case it s the A2 bird cage flash hider. Reasonably priced and a great vale for flash suppression on an AR-15 Spike s offers this renowned muzzle device with their excellent quality control. Ideal for a modern sporting rifle builds this is a great no nonsense muzzle device. Spike s Tactical AR-15 A2 Flash Hider .223/5.56 Caliber 1/2x28 TPI Phosphate%u200B Specifications: Spike s Tactical A2 Flash Hider .223/5.56 Caliber 1/2x28 Thread Pitch Mil-Spec Crush washer included 1.75 length 2.2 oz Mil-Spec Heavy Phosphate Finish