YANKEE HILL MACHINE R9 9MM HANDGUN SUPPRESSOR Don't let the 9 in the name fool you. The YHM R9 can handle so much more than 9mm, making it incredibly versatile while still being very affordable. If you're the kind of shooter who likes to run high volume quantities of ammo through handguns, SBRs, and subguns, then the R9 is exactly what you need. It's even rated for limited full-auto fire, so go ahead and send it! The fully-welded, tubeless design is built from stainless steel for rugged durability no matter what caliber you're using. Speaking of calibers, the YHM R9 is compatible with everything from 17HMR to 9mm in the Mfg: Yankee Hill Machine Co., Inc.