The versatile R45® is at home with a wide variety of host firearms and calibers.The robust design allows it to be used for calibers ranging from .17 HMR all the way up to the legendary .45-70 Government.Constructed from heat treated 17-4 PH stainless steel. The R45 ships with a 5/8”x24 direct thread mount, 2 suppressorwrenches, and accepts our full lineup of 1-3/8”x24 HUB mounting options.