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. - Replaces your Direct Thread Adapter - 17-4 Stainless Steel - Matte Black Finish - 1-3/8 -24 Mount Thread Pitch
YANKEE HILL MACHINE | UPC: 841812101215
