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The gun has been upgraded, although with what I'm not sure. I emailed the guy who I had bought it from but he said the person before him had done up these upgrades.
I've installed many upgrades on guns for my teamates with springs up to M120 but when pushing my spring back in it didn't feel as stiff. If I were to guess I'd say close to the 350fps mark(its not the stock spring).
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