The Yankee Hill Machine Nielsen Booster Assembly is a stainless steel replacement adapter designed for shooters running suppressed handguns or any 1-3/8"-24 threaded suppressor. If you're already running a YHM Sound suppressor or another can with that same thread pitch and want to convert to Nielsen-style piston operation, this assembly swaps in for your factory direct-thread adapter. It's built from 17-4 stainless steel with a black oxide finish, so it'll hold up to the heat and gas cycling while keeping its looks.

The Nielsen Booster design lets you run a piston-driven suppressor on handguns where you need the extra mass and recoil impulse to cycle reliably. The piston decouples from the can itself, reducing back-pressure and wear on both the suppressor and your firearm. That means softer shooting and longer suppressor life, especially on smaller-frame pistols or when you're chasing subsonic loads.

Keep in mind this is the booster assembly only—you'll need to source your own compatible piston separately. Silencerco, Rugged, Dead Air, and Odessa pistons work with this assembly. We also want to flag that Sidewinder-pattern pistons are not compatible with this setup, so double-check your piston type before ordering.