The YHM 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.
Yankee Hill 2055 Nelson Booster Assembly 1-3/8″-24 tpi 17-4 Stainless Steel Matte Black
