This flash hider is used for our 7.62 Phantom Q.D. Sound Suppressor. It retains the excellent flash hiding capabilities of the original Phantom. This flash hider WILL NOT accommodate YHM's 5.56 Sound Suppressor. Available in a wide array of thread sizes. If you are looking for this item in 1/2x28 please order the YHM-3102 in 1/2x28 as they accept the 7.62 suppressor. REMEMBER TO ONLY USE 5.56 AMMO WITH THE YHM-3102.