These 3-lug muzzle devices require a 3-lug mount to attach a suppressor. 3-lug mounts are available separately here. The .45 caliber 3-lug muzzle devices must be used only with 45 caliber 3-Lug Mounts. The 9mm 3-lug muzzle devices must only be used with 9mm 3-lug mounts.
SilencerCo, 3-Lug Muzzle Device, 45 ACP, .578×28, Black Finish