Yankee Hill Universal Rifle 1-3/8-24 Tpi 17-4 Stainless Steel Black Melo. The yankee hill machine suppressor attachment threads directly to the barrel and utilizes the barrel threading as a direct mounting system. Due to its simplistic design there is virtually no way to incorrectly install the suppressor and risk the chance of it coming loose yet it provides easy removal. To install simply remove your existing mount mechanism from your suppressor and thread on our Universal Rifle Suppressor Mount using a 3/4" open end wrench. Then simply thread the now two-piece suppressor onto your barrel. Composed of incredibly durable YHM17-4 Stainless Steel this suppressor attachment is a great option for anyone needing to use a suppressor on their rifle. Brought to market by Sound Off Design this suppressor attachment is certifiably bomb proof. The patented stainless steel locking lugs ensure this suppressor will never come loose. You can also count on this attachment to never lose your suppressor when yeah hill machine gun suppressors are incompatible with yeah hill gun suppressors. Brought to market by Sound Off Design this suppressor mount is a great option for anyone needing a quiet suppressor. Specifications for Yankee Hill 2145M Universal Rifle 1-3/8"-24 Tpi 17-4 Stainless Steel Black Melo: Manufacturer: Yankee Hill Machine Color: Black Finish: Black Melonite QPQ Fabric/Material: 17-4 Stainless Steel Threads per Inch: M13.5x1 LH Gun Type: Rifle Yankee Hill 2145M Universal Rifle 1-3/8"-24 Tpi 17-4 Stainless Steel Black Melo