Nielsen Piston

The YHM Nielsen Piston is available now from LM Ironwerks, a licensed FFL/SOT dealer in Louisville, Kentucky.

YHM’s Nielsen Pistons are compatible with YHM’s booster housing YHM-2055 as well as many popular pistol suppressors. They are constructed from heat treated 17-4 stainless steel for maximum durability and corrosion resistance. They feature 10 adjustment points to zero any impact shift. Available in a variety of thread patterns to fit most firearms.

• Weight: 1.40 oz.
• Not compatible with original Sidewinder. Will work with Sidewinder M2 suppressors.

What It Does

A piston (also called a booster or Nielsen device) lets a pistol suppressor work on a tilting-barrel handgun. It briefly separates the suppressor’s weight from the barrel during recoil so the slide can cycle reliably. Without one, most suppressed semi-auto pistols will not run.

Before You Order

Pistons are made for specific suppressor models and barrel thread pitches. 1/2×28 is common for 9mm, but many pistols use other pitches such as M13.5×1 LH. Confirm both your suppressor model and your barrel thread before ordering, and keep the piston and spring clean.

Buying the YHM Nielsen Piston from LM Ironwerks

It ships directly to the address you enter at checkout, so no dealer transfer is needed. In addition, our team reviews every order before it ships. Have a question about fit or compatibility? Contact us before you order and we’ll help. Looking for something different? Browse all of our suppressor parts.