The Yankee Hill Machine R9 is a 9mm Luger suppressor with a 1.562-inch outer diameter, constructed from 17-4 stainless steel with a black Cerakote finish. It has a 1/2"-28 tpi threaded connection for mounting on compatible 9mm hosts. Transfer requires additional federal paperwork. 
 

Key Specifications 

• Brand: Yankee Hill Machine Company 
• Model: R9 
• Caliber: 9mm Luger 
• Color/Finish: Black Cerakote 
   

Detailed Features 

• 17-4 stainless steel construction 
• Black Cerakote finish for corrosion resistance 
• 1.562-inch outer diameter 
• 1/2"-28 tpi threaded mount 
• Designed for 9mm Luger hosts

Owners of the YHM R9 consistently cite the 17-4 stainless steel construction as a durability plus, noting it handles sustained fire better than aluminum-body alternatives. The black Cerakote holds up well in field use, and the 1/2"-28 thread connection is a standard fit for most 9mm pistols and carbines in the popular thread spec.

The 1.562-inch diameter is compact enough to clear most iron sights without significant height-over-bore issues. Some owners would prefer a direct-thread mount with a wider thread diameter for rock-solid lockup, while others find the standard 1/2"-28 mount perfectly adequate for their use.

Value versus comparable stainless 9mm cans generates debate. The R9 tends to land in a competitive price bracket, and YHM's service reputation provides some peace of mind. Buyers who prioritize longevity over minimum weight consistently favor the all-steel build of the R9.