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I ordered the KNS piston a skeptic. Thought, "there's no way it can make THAT big a difference". Well color me surprised. I installed this into a Zastava zpap m70, and it cut recoil nearly in half. Combined with a zastava zvuk suppressor, it's also cut about half the gas to the face. The internals of the gun tend to stay a little cleaner as well, although the gas tube and piston get dirty way faster. It's a worthwhile purchase. And opticsplanet making it even cheaper than the manufacturer makes it a no brainer.
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