YHM's .R45 suppressor is our most versatile suppressor system to date. It was created to provide the shooting enthusiast a quiet lightweight and cost effective suppressor. This one suppressor can be used on a variety of calibers such as .45 ACP 9mm Luger 5.56mm NATO .300 Blackout .308 Winchester and even .45-70! The notched rim and tri-port muzzle on the end cap make it stand out among the crowd. Like the R9 the R45??? uses a tubeless design which consists of heat treated 17-4 stainless steel. - The R45??? ships with 2 wrenches and a 5/8-24 Direct Thread HUB Adapter. - Caliber 45 Cal. - Max Caliber .45-70 Government - Overall Length 6.45 - Diameter 1.563 - Weight 13 Oz. - Suppression Level 132dB on a 7.8 barrel with 230 gr. FMJ - Material 17-4 Ph SS - Finish Matte Black Cerakote - Method of Attachment 5/8-24 Direct Thread HUB Adapter - Full Auto Rated Limited Use