This flash hider is used for our .30 Cal. Phantom Q.D. Sound Suppressors YHM-3300 and YHM-3300-Ti. It retains the excellent flash hiding capabilities of the original Phantom. Available in a wide array of thread sizes. This flash hider WILL NOT accommodate our 5.56 sound suppressors or our .30 cal. Light Tactical (LT/A) sound suppressors.