YHM's R45 suppressor is their most versatile suppressor system to date. It was created to provide shooting enthusiasts with a lightweight, quiet, and cost-effective suppressor. The YHM R45 suppressor adds considerable versatility with multi-caliber flexibility. This silencer can be used on calibers such as .45 ACP, 9mm Luger, 5.56mm NATO, .300 Blackout, .308 Winchester, and even .45-70! The R45 also comes equipped with HUB mount compatibility out of the box while maintaining a lightweight and effective package. - 7.62x51 / .308 Winchester: 16" minimum barrel length - 5.56 NATO: 16" minimum barrel length - 300 Blackout: 7.5" minimum barrel length