The Phantom flash hider is used with the YHM Q.D. Phantom Sound Suppressor. It retains the excellent flash hiding capabilities of the original Phantom. This flash hider also accepts the Phantom 7.62 Sound Suppressor. This flash hider will NOT accommodate the YHM .22 Q.D. or 9mm Q.D. suppressors. The Carbon Scrapers (Teeth) remove or scrape carbon from the internal support system of your can. The Dual Support System supports and aligns the suppressor to your bore. The five (5) port design decreases visible flash. The External Locking Mechanism keeps heat away from the spring mechanism. A High-Temperature Spring holds up better over a longer service life. The aggressive teeth give it a mean aggressive look. The External Grooves were removed for a sleek smooth look and it reduces carbon build-up for easy clean up. The Dust Enclosure hides and protects all internal moving parts within the quick disconnect system. This model is for 5.56mm with 1/2-28 TPI.”