Daniel Defense SoundGuard, SG-556, Suppressor, 223 Remington, 556NATO, Black, Direct Thread, 556 Configuration, Matte, 1/2-28 06-140-04249 Constructed of stainless steel or titanium (see drop-down menu), Daniel SoundGuard Powered by KGM Suppressor 1.375-24 HUB direct-thread adapters are available in in 1/2 - 28" and 5/8 - 24" TPI and provide rock-solid mounting and rapid attachment/detachment. They utilize a non-proprietary flat wrench (included) that attaches or removes the adapter to the suppressor tube or an appropriately threaded firearm muzzle in seconds-no additional or special tools necessary! Because no mounting adapters or other mounting hardware is required, these direct-thread adapters allow the suppressors to be conveniently and easily switched from one firearm to another compatible-caliber firearm with an appropriately threaded muzzle.