The Yankee Hill Machine Nielsen Piston 9mm M13.5x1LH is a Nielsen suppressor piston from Yankee Hill Machine, built to M13.5×1 LH spec. Yankee Hill Machine machines it (Yankee Hill Machine part no. YHM-2060-M) to factory tolerances rather than as a generic aftermarket stand-in. It is a Nielsen-style spring piston that lets a pistol-caliber suppressor’s mass float independently of the host’s slide. Without a piston, the extra weight of a suppressor hanging off the muzzle can rob a semi-auto pistol of the slide velocity it needs to cycle reliably, and this piston restores normal function. It is a practical pickup for a range gun, hunting rig, or working suppressor setup that needs the correct hardware to run right.

Key Specifications

• M13.5×1 LH thread pattern is the host barrel thread this piston’s booster body indexes onto.
• Left-hand thread runs in reverse of a standard right-hand thread, which keeps the part from backing itself off the barrel under recoil on hosts that require it.
• 9mm is the caliber this part is built and sized for.

Frequently Asked Questions

What host thread does this piston fit? It indexes onto a M13.5×1 LH threaded barrel; confirm your pistol’s thread spec matches before ordering.

Do I need a piston to run a suppressor on a pistol? On most semi-auto pistol hosts, yes; without a piston isolating the suppressor’s mass from the barrel, the added weight can slow the slide enough to short-stroke the action.

What caliber is this part built for? It is sized for 9mm; running it on a different caliber host is not something the manufacturer specifies as safe or correct.

Buy the Yankee Hill Machine Nielsen Piston 9mm M13.5x1LH

Order the Yankee Hill Machine Nielsen Piston 9mm M13.5x1LH directly from Schaefer Defense and get it moving toward your bench today. Ships fast from our Lubbock, Texas gun shop, direct to your door with no FFL required. Check out the rest of our gunsmithing tools lineup for the other small parts that keep a suppressor setup running right.