The Yankee Hill Machine Nielsen Booster Assembly replaces the direct thread adapter on a YHM Sound suppressor or any other suppressor on the market which utilizes the 1-3/8"-24. They are designed to be used with handguns and barrels which require a Nielsen Piston spring.

Note: DOES NOT INCLUDE PISTON

Features

• Replaces your Direct Thread Adapter
• 17-4 Stainless Steel
• Matte Black Finish
• 1-3/8”-24 Mount Thread Pitch