KNS precision/adjustable gas piston for Galil?

Batty67

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Per strong recommendation of Jeff Miller of Hillbilly Firearms, I've swapped-out the original gas piston for my new to me pre-ban AA Galil 386. Piece of cake with just one roll-pin to punch out. I'm looking forward to shooting and adjusting it this weekend. On my first shooting session, as expected, my Galil was throwing dented brass like 30+ feet.

Do folks here use these pistons much? Good experiences?
 

kanewtervalve

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What are the advantages of the KNS gas piston?

Wear and tear on the gun, effed up brass if you reload. I just ordered one for my PSL, it was literally putting brass on my roof when I was shooting from a bench on my deck.
 

timkel

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Per strong recommendation of Jeff Miller of Hillbilly Firearms, I've swapped-out the original gas piston for my new to me pre-ban AA Galil 386. Piece of cake with just one roll-pin to punch out. I'm looking forward to shooting and adjusting it this weekend. On my first shooting session, as expected, my Galil was throwing dented brass like 30+ feet.

Do folks here use these pistons much? Good experiences?

I recently posted about KNS adjustable gas pistons. Two thumbs up! Where did you find one? The usual places were sold out on the Galil model.
http://www.uzitalk.com/forums/showthread.php?95016-KNS-Precision-AK-adjustable-gas-piston
 

Batty67

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I ordered directly from KNS. Got a combination AK/AR sight adjustment tool. I'm taking my Galil to shoot again Sunday and will be adjusting the gas piston. I already added a recoil buffer, which I might be able to remove, depending on how the adjustable gas piston does. It makes it more difficult to put the top cover back on. I'll report back later.
 

Batty67

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Great day of shooting. I adjusted the gas piston so it was only throwing brass 6 to 12 feet, and 90% in good or better shape. And 100% reliable. Only disappointment was a new Bulgarian-made 35-round magazine was no bueno with Galil. Everything else was spinning like a top. I tossed the Bulgarian magazine. Oh well.
 

Bret

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I installed a KNS piston in my Springfield Galil. Out of the gate with it all the way closed, it cut the ejection distance by over half. When all was said and done, I set it at 20 clicks from fully closed. Norma 55gr 223Rem and IMI 55gr 5.56x45 would eject and feed 100% to about eight feet, but Tula 55gr 223Rem would eject without feeding the next cartridge. Since I'm only going to run the first two in it from now on, I think it's set in the perfect spot.

Springfield-Galil-at-the-range.jpg
 

timkel

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I installed one in a Century Golani. It calmed it right down. I also put them in a RPK-74 and AKS-74U. I set them all to run Tula. Then I know they will run anything.
 

andresere

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My KnS experience

108219420_281240489604407_920055246897911275_n.jpg With a PSL, it gave me this using out of the box PPU 150gr SP ammo, plus didn't mangle the brass. that's 7 rounds. Jeff Miller has my Galil now and I sent a KnS with it.
 

boscoman

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I see on their web sight that they don't recommend for 308 Galils. Has anyone run one of these on a 308 Galil?

Have you guys been running the system listed for the Galil ACE or one of the other AK systems?
 

Jager

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On the KNS website, the drop down boxes. There are two listed for the Ace. One for the Galil Ace rifle, and another for the Galil Ace pistol (not .308). I'm going to order one for my .308 rifle because I have a can. It looks to me like "not .308" is just in regards to the pistol length.
 

boscoman

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Ah, thanks. I missed the "valmet/galil" & the other Galil specific listing.

One of my less than observant moments
 

Bret

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I installed a KNS piston on my 5.56x45 Galil Ace pistol (that will be an SBR when/if the ATF ever approves my efiled stamp). Keep in mind that this 5.56x45 Ace was a special release that takes original Galil magazines and new Galil magazines that have a bolt lock back follower. Unlike most other KNS pistons, this one is very short because there is no neck to the piston. It was easy to change out with the factory piston. It came with a large and a small opening. After installing it on the bolt carrier, I had to swap the large opening for the small opening and set it to the proper torque. All in all, the installation was pretty easy. I still don't understand why KNS includes roll pins that are only long enough to catch on one side of the piston's wall.

I test fired it yesterday and started with the valve fully closed using a Galil 10rd magazine that came with my Springfield Galil that's pictured above. Note that this piston has a much smaller range than most of the other KNS pistons. The spent cases ejected with too much velocity and went very far. I then adjusted to ten clicks open and fired five cartridges. The spent cases would weakly eject, but would not cycle then next cartridge into the chamber. I then went to five clicks and back to seven clicks and had 100% reliable function with both. Thinking I was good, I decided to load up a new 30rd Galil magazine and blast through it to confirm reliable function at seven clicks. Unfortunately, the spent cases would eject, but feeding was unreliable for the first five cartridges or so. After that, it would run fine. I had to adjust the piston back down to five clicks from closed in order for the pistol to function reliably through an entire magazine. During this testing process, I concluded that the new spring in the new 30rd Galil magazine is putting high pressure on the cartridges which are in turn putting pressure on the bottom of the bolt which slows down the cyclic rate. Interestingly, when I started with a full magazine and the KNS piston adjusted to five clicks, the first five spent cases would go a pretty short distance. Then as I fired through the magazine, the spent cases would go further and further. The bottom line here is that the pressure caused by the magazines on the bottom of the bolt does impact the ultimate setting that you can achieve for reliable function. It's something that I never would have thought about. I'm going to try these new Galil magazines in my Springfield Galil to see if I'll need to adjust it's piston setting when using them.
 
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