+1-800-504-5897 Live Chat Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Reviews & Ratings for KNS Precision Adjustable Gas Piston System — 100 reviews

(100 reviews)
KNS Precision Adjustable Gas Piston System
KNS Precision Adjustable Gas Piston System
As Low As $140.00 Save Up to 18%
View Product
Write a Review
Compare (0)
1 item has been added
Add at least two items to compare
Most Helpful Positive Review This Is Version 2.0
I was concerned when I ordered and asked CS if they knew if it was the original or the revised version with the new gas regulator. CS could not tell me, but when it arrived it was the new revision. I ordered the M92 version in February 2020. As a side note, if you get the old version and it breaks, ...
Read More...
Most Helpful Negative Review didn't work for me
I ordered this for my Galil Ace 7.62x39 rifle. Since the piston for the Ace is held with a roll pin, it was easy to remove the factory piston and replace it with the KNS piston. But I noticed that the roll pin size (and the hole) for the KNS is smaller than that for the Ace. As I was trying to find ...
Read More...
Show
Sort by
Filter by

Exactly as expected perfect

by jason, Verified Owner from IN, United States Written on April 28, 2026
Perfect quality excellent Machining exactly what you need for suppressing an AK or one that is over gassed
Pros:
  • Pricing ease of installation
Cons:
  • Must have some mechanical skills to install
  • Will require tools to install hammer drill punches Etc
Best Used for:
  • Over gassed or suppressed rifles
Would recommend: Yes
Was it helpful to you? Yes | No
Share

I absolutely love it

by kingjose75, Verified Owner from TX, United States Written on April 19, 2026
Love it, took some convincing in the beginning due to fouling but some gun lube took care it that
Best Used for:
  • AKM AK47 stamped receiver but with some work will go on milled
Would recommend: Yes
Was it helpful to you? Yes | No
Share

Bob from PA

by Bob, Verified Owner from PA, United States Written on April 3, 2026
Fast delivery,,, easy to install,,, works like a charm,,, totally corrected my overgassed weapon,, like night and day as to performance! Great price point too!
Would recommend: Yes
Was it helpful to you? Yes | No
Share

adjustable for ak gas

by Meet the Targets, Verified Owner from PA, United States Written on March 8, 2026
KNS just hit this out the box with making a adjustable gas piston for my zpap. I the only reason for this is because i have a wolverine suppressor and it comes over gas already.
Would recommend: Yes
Was it helpful to you? Yes | No
Share

KNS Adjustable Gas Piston - AKM

by Stormshadow, Verified Owner from CO, United States Written on November 24, 2025
The KNS Adjustable Gas Piston - AKM is a must have if you own a Kalashnikov style rifle. Dramatically cuts down recoil on an overly gased rifle and your spent casings aren't flying 60' feet smacking the dude in the head that's four benches over at the range. This is my second KNS Adjustable Gas Piston. Definitely recommend and absolutely satisfied with the purchase and product.
Would recommend: Yes
Was it helpful to you? Yes | No
Share

Century arms vska application

by Gj, Verified Owner from OR, United States Written on November 18, 2025
My firearm now has drastically less recoil, also my shells only fly about 5 to 6 ft away now which is really nice. Love it
Pros:
  • None
Cons:
  • None
Would recommend: Yes
Was it helpful to you? Yes | No
Share

KNS Adjustable Piston

by Dodgeville21B, Verified Owner from TX, United States Written on October 29, 2025
A great product! If you have an AK that is over gassed, then this item is for you. If you know how to use a drill, then installation is extremely easy. My rifle now does a it should.
Pros:
  • Works great
  • Great product
Cons:
  • None
Best Used for:
  • Gassing problems
Would recommend: Yes
Was it helpful to you? Yes | No
Share

Good AK Gas Piston Choice

by Will, Verified Owner from TX, United States Written on October 12, 2025
After doing some research I decided to on a KNS gas piston for my Galil 386. Most AK rifles are over gassed by necessity but this piston allows the user to adjust for a variety of ammunition. Optics Planet’s sale event saved me $40. I plan to upgrade my other Ak rifle asap.
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No
Share

Not Intended to Increase Gas For Subsonic Ammo-Per Instructions

by K Squared, Verified Owner from NM, United States Written on September 25, 2025
I should have read the instructions first. I was hoping to get subsonic ammo to cycle in my Ak47 (WASR-10), by increasing the gas flow to the recoil system. The instruction state that this piston is not intended to do that.
The instructions also mention that the original piston may be welded in place and be difficult to remove. Right again! It took me a couple of days and several broken drill bits to get the original piston out. I also destroyed the original piston in the process.
Having said all that, this piston can greatly reduce gas flow with or without a silencer installed.
Would recommend: Yes
0 of 1 found the following review helpful.
Was it helpful to you? Yes | No
Share

KNS Gas Piston for AK47

by Al, Verified Owner from MO, United States Written on August 28, 2025
The KNS piston is an excellent product I recommend for every AK variant owner. The install was easy with a hand drill, punch and hammer. My Chinese Mac 90 variant was so overgassed with a suppressor it was malfunctioning. It was very simple to tune it and now it runs perfectly.
Pros:
  • easy to install
Cons:
  • None
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No
Share
There are no reviews that match your criteria. Would you like to review this product?