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If your AK spits brass halfway across the range and beats you up with more recoil than a 7.62 should, that is the classic sign of an overgassed rifle. The KNS Precision Adjustable Gas Piston System for the AKM gives you a way to fix that without cutting, welding, or sending your rifle off to a shop. It replaces the factory piston head that attaches to your bolt carrier, and it opens up an adjustable gas port so you can meter exactly how much gas cycles the action. Back it off for less felt recoil and reduced wear, or open it up for cold weather and dirty ammo. This large bore model is built for 7.62×39, .308, and 7.62x54r AK pattern rifles with a working length of 5.83 inches.
An overgassed AK runs harder than it needs to, which means more recoil, faster cyclic rate, and more stress on every moving part. Dialing the gas back with the KNS adjustable piston smooths out the recoil impulse, tightens up your ejection pattern, and takes some of the pounding off your carrier and internals over the long haul. It is especially handy if you are running a suppressor, since a can adds backpressure and makes an already gassy AK downright rowdy. A good rule of thumb: if your rifle is throwing spent cases more than about 15 feet, this piston is going to make a noticeable difference.
KNS Precision machines these in Texas from stainless steel, and the surfaces are nitrided for corrosion resistance and low friction, which also makes cleanup easy. This updated version got a beefed-up adjustment collar with a roller detent, so the settings hold where you put them and the whole assembly shrugs off knocks and impact better than the older design. Adjustment is tool-free once installed, with clicks you can feel as you tune it in.
Most installs take around ten minutes and boil down to driving out the pin that retains your factory piston, swapping in the KNS unit, and re-staking. Because AK rifles vary so much between makers, measure your existing op rod against the 5.83 inch working length before ordering to confirm fitment. A small number of commercial-spec guns have the piston welded to the carrier rather than riveted, and Vepr and Saiga carriers may need the op rod drilled during install, so it is worth checking your setup ahead of time. This piston counts as one U.S.-made part toward your build.
This is the large bore model made for 7.62×39, .308, and 7.62x54r AK pattern rifles with a 5.83 inch working length. Because AK builds vary a lot between manufacturers, measure your existing op rod against that length before ordering to confirm it lines up. If your rifle uses a shorter piston or a small bore setup, KNS makes other models in the lineup to match.
For most rifles it is around a ten minute job with no major gunsmithing or permanent modification. You drive out the pin holding your factory piston, thread in the KNS piston, and re-stake it to the carrier. A few commercial-spec guns have the piston welded to the carrier instead of riveted, and Vepr and Saiga carriers may need the op rod drilled, so check your setup first.
Yes, this is one of the main reasons people run it. A suppressor adds backpressure and makes an already overgassed AK cycle even harder, and the adjustable piston lets you dial the gas down to a comfortable, controllable level. You can tune one setting for suppressed shooting and open it back up when you take the can off.
Metering the gas reduces felt recoil and slows the cyclic rate so the action is not slamming harder than it needs to. That tightens up your ejection pattern and eases wear and tear on the bolt carrier and internal parts over time. If your AK is throwing brass well past 15 feet, you will feel a real difference after tuning it in.
| UPC | 851876003318 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AGP-A-10 |
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