Unicorn Airsoft
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Unicorn Airsoft's 265mm inner barrel replaces the stock barrel in most M4 and M16 AEGs to improve accuracy and shot-to-shot consistency. It's stainless steel with a Nitrolon coating, so BBs slide through with less friction and the bore resists corrosion. The 6.03mm tightbore diameter creates a tighter air seal than a standard 6.08mm barrel, which helps stabilize BB flight for tighter groupings. At 265mm (roughly 10.5 inches), it fits carbines and short-barrel builds without the length penalty of a full 400mm+ barrel. You'll need a basic tool set to swap it; the gearbox itself doesn't need to be opened.