Used for the Q.D. Phantom Sound Suppressor; Fits AR-15 rifles chambered in .223 Remington or 5.56mm NATO Threaded 1/2"x28 TPI; Carbon Scrapers (Teeth) removes or scrapes carbon from the internal support system of your can; Dual Support System supports and aligns the suppressor to your bore; 5-port design decreases visible flash; External locking mechanism keeps heat away from the spring mechanism; High-temperature spring holds up better over a longer service life; Aggressive Teeth for a mean aggressive look; Dust Enclosure