Our pistons were designed to be easily changed for different host firearms or calibers. Pistons are built with 17-4 stainless steel, then heat-treated for maximum durability. The piston is part of the Nielson device that moves and allows semi-automatic cycling for unlocking pistol barrels. Throw a Fixed Barrel Spacer on for fixed barrel applications. SilencerCo pistons have female threading that attaches to our SilencerCo threaded barrels.

Not sure which threads you need? Check our Piston Fit Guide

Compatible with

  • Omega K Series
  • Hybrid 46
  • Hybrid 46M with Charlie Piston Mount
  • Osprey Series
  • Octane Series
  • Omega 36M with Charlie Piston Mount



  • .578 X 28 (AC24)
  • 1/2 X 28 (AC25)
  • M13.5 X 1LH XL (AC626)
  • M13.5X 1LH (AC26)
  • M14.5 X 1LH (AC27)
  • M16 X 1LH (AC28)
  • M16 X 1RH (AC29)
  • 5/8 X 24 (AC30)
  • 9/16 X 24 (AC31)
  • 1/2 X 36 (AC57)
  • 1/2 X 28 XL (AC59)
  • .578 X 28 XL (AC1346)
  • 1/2 X 28 SN (AC1756)


XL pistons are for firearms where the silencer requires additional length between the threaded barrel and the silencer.

The 1/2×28 SN Piston will index on the muzzle of the barrel instead of the shoulder. This is used on small profile pistol barrels with an inadequate shoulder diameter

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The SilencerCo Brand.

Since our birth in 2008, our dedication to authenticity and innovation has never wavered. Today, we continue to focus on exceptional customer service and industry-leading products; products that are crafted by people with the utmost dedication to our industry. We are hunters, shooters, and gun enthusiasts, just like you. Our mission is to bring you products that will enhance your shooting experience.