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If your Arsenal large bore rifle is flinging brass across the county and beating itself up in the process, this KNS Precision adjustable gas piston is the fix a lot of folks reach for. It replaces the factory piston head and threads right into the bolt carrier, giving you a tunable gas system that lets you dial the rifle in for exactly how you shoot. The rule of thumb KNS uses is simple: if your rifle throws brass more than 15 feet, it's likely over-gassed, and that excess gas means more recoil, faster wear, and less control. This piston lets you take that energy back out of the equation.
The whole idea here is tuning. A hole at the tip of the piston routes excess gas to a vent further back, letting it bleed out of the gas tube instead of slamming the carrier rearward harder than it needs to. The updated Mod 2 collar gives you a wide range of tool-free adjustment, so you just rotate the head, count your clicks, and test-fire until the rifle runs clean. Most people land on one setting for suppressed shooting and another that keeps things reliable with cheaper steel-cased ammo.
This one is machined from heat-treated stainless steel and finished in corrosion-resistant nitride, so it holds up to a serious round count and cleans up easy thanks to the low-friction design. There's a built-in roller detent to hold your setting, plus multiple through-holes at the base that help the assembly self-align and account for the AK platform's famously loose tolerances.
Install runs about ten minutes during a normal field strip using hand tools. You drift out the retaining rivet, unscrew the old piston, thread in the KNS unit, match your working length to the factory measurement within about 0.03 inches, and tap in the supplied roll pin. No press, no permanent modification, and it's built specifically for the Arsenal large bore pattern. Since AK dimensions vary, it's smart to measure your op rod against the KNS fitment chart before ordering to confirm this is the right model for your rifle.
The quick test KNS recommends is watching where your brass lands. If your rifle is throwing empties more than about 15 feet, that usually points to an over-gassed system pushing the carrier back harder than needed. Keep in mind not every AK is over-gassed, so if yours already ejects gently, you may not see a big change.
No. It installs during a standard field strip using hand tools in roughly ten minutes by drifting out the retaining rivet, swapping the piston head, and tapping in the supplied roll pin. There's no permanent modification, which is why it pairs well with collectible or original parts kits.
That's one of the most popular reasons people buy it. A suppressor adds back pressure that makes an already over-gassed rifle cycle harder and vent gas toward your face. Dialing the collar down lets you cut that excess gas so the rifle runs softer and cleaner with a can attached, and most owners keep separate click settings for suppressed and unsuppressed use.
Because AK-pattern rifles vary a lot in dimensions, KNS publishes a fitment chart based on working length and hole distance. The most reliable approach is to measure your existing piston and op rod, then compare against that chart before ordering. This model is cut specifically for the Arsenal large bore pattern.
| UPC | 853906008355 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AGP-A-20L |
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