YANKEE HILL MACHINE R45 45 CALIBER RIFLE SUPPRESSOR The YHM R45 is Yankee Hill Machine's most versatile suppressor. This suppressor adapts seamlessly to various calibers, from .45 ACP and 9mm Luger to 5.56mm NATO, .300 Blackout, .308 Winchester, and even the formidable .45-70. The R45 was designed with a focus on providing shooting enthusiasts with a lightweight, quiet, and cost-effective solution. Distinguished by its notched rim and tri-port muzzle on the end cap, the R45 sets itself apart in the realm of .45 caliber suppressors. Like its smaller sibling, the R9, the R45 employs a tubeless design constructed from heat-treated 17-4 stainless steel, ens Mfg: Yankee Hill Machine Co., Inc.