Yankee Hill Machine Company Nielsen Piston Features The Yankee Hill Machine Nielsen Piston is a purpose built suppressor accessory that lets a semi-auto pistol s barrel reciprocate normally while a suppressor is mounted to it. Without a piston system the added mass and length of a suppressor on the end of a pistol barrel can disrupt the slide cycling that the gun needs to function. The Nielsen Piston isolates that reciprocating motion from the suppressor body itself so the firearm keeps running the way it was designed to. This is standard practice on pistol suppressor hosts and is a key reason dedicated piston units are sold separately from the can itself. Manufactured by Yankee Hill Machine a company with a long track record in the suppressor and muzzle device space the Nielsen Piston is built for direct compatibility with YHM s own suppressor platforms. It is not threaded which keeps it specific to the piston style mounting system it was designed around rather than a direct thread interface. Pistol shooters running suppressed setups rely on a correctly matched piston to keep reliability consistent across thousands of rounds. The Yankee Hill Machine Nielsen Piston gives suppressor owners a factory replacement or spare component to keep their system cycling the way it was built to. Yankee Hill Machine Company Nielsen Piston Specifications Manufacturer: Yankee Hill Machine Company Model: Nielsen Piston Caliber: .40 Caliber Available At: GrabAGun Thread Pitch: M14.5x1LH