The YHM R9 9mm suppressor is designed to be a versatile and affordable option for shooters. It is capable of handling high volumes of fire and can be used with a variety of calibers, including 9mm, .300 BLK, and .308 Win. The R9 is also compatible with handguns when used with the Nielsen Booster Assembly. It accepts a full line of HUB mounting options and ships with a 1/2" - 28 Direct Thread HUB Adapter, YHM-2007, and YHM-2146. Cartridge - Minimum Barrel Length 7.62x51 / .308 Win - 16" 5.56 NATO - 16" 300 Blackout - 7.5" 350 Legend - 16" 6.5 Grendel - 16"