The YHM R45 suppressor is made from durable 17-4 PH stainless steel and is compatible with a wide range of firearms and calibers, from .17HMR to the powerful .45-70 Government. It ships with a 5/8-24" HUB Direct Thread Mount, a YHM-2007, and a YHM-2146. Cartridge - Minimum Barrel Length .45 - 70 - 16" 350 Legend - 16" 7.62x39, 6.8SPC, 5.56 NATO - 16" .300 BLK - 7.5" .45 ACP - 3"