AK Adjustable Gas Piston


The MOST accurate way to ensure correct fitment of our piston to YOUR gun is for YOU to measure your working length & hole distance and compare it against our chart.  Please understand that we do not make a piston for all AK platforms.  Not all AK’s are over-gassed.  IF your AK is not over-gassed, this piston system may not work in your firearm.


For additional detailed information please click the links below!

Adjustable Gas Piston User Manual V3

Galil ACE Pistol Piston User Manual V1


Finally, a drop-in solution for taming the notoriously-overgassed AK platform. The patented KNS AK Adjustable Gas Piston is a replacement for the AK's piston that attaches to the bolt carrier in about 10 minutes with no major gunsmithing or permanent modification required. The user is granted an extremely wide range of gas adjustment for suppressed and unsuppressed use in over-gassed AK’s, as well as a variety of different kinds of ammunition.

A good rule of thumb to determine if our piston will be useful, is if your gun throws the brass more than 15 feet. This can, but not always signify excess gas pushing the carrier back at a higher velocity and pressure, than is needed for effective operation. Most (but not all) AK's are over-gassed. This causes more recoil, more wear and tear, and less controllability. Many users are surprised to feel the difference in how their over-gassed gun shoots with our Adjustable Gas Piston System installed.

Your AK MAY NOT benefit from and may actually impede function with our piston system installed under the following circumstances:

  • the firearm was properly tuned or slightly under-gassed (our system only takes away gas, it does not add gas)
  • Variations in the AK platform.  Not all AK’s are the same!!
  • The use of some aftermarket parts 

We’ve redesigned and improved the adjustment collar for your AK Adjustable Gas Piston. With robust collar geometry and the addition of a roller detent, this version is MUCH stronger and protects all critical components from impact.

There is no need to remove or replace your gas block for adjustability. Just change the piston, and go shoot.

Small Bore/Caliber pistons are for .223", 5.56mm, and 5.45mm. They work better in AK's of ALL CALIBERS with less excess gas.
Large Bore/Caliber pistons are for 7.62x39, .308", and 7.62x54r.

**When selecting your piston please refer to the chart pictured above to ensure maximized compatibility with your firearm.**

***A small percentage of Commercial Spec firearms have the piston welded to the carrier, instead of the usual Rivet holding in the Piston. We recommend purchasing a new carrier for the easiest installation.***

**** Vepr and Saiga Pistons will require drilling through the op-rod after screwing the piston into the carrier, due to variations in the staking location. These Op-Rods are Phosphated instead of Nitrided to allow easy drilling.****

Key Benefits:

-Updated Mod 2 Collar

-Tool-Free Adjustment

-Reduces Recoil

-Tune almost any AK for suppressed use

-Decrease cyclic rate for full-auto fire

-US-made 922r Compliance Part

-Piston head assembly made from corrosion-resistant stainless steel

-All surface parts nitrided for durable, low-friction, & easily-cleaned operation

-Patent Number 10,330,480



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