Unicorn Airsoft
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Unicorn's GBB 50 degree hop up bucking is a 6mm bucking made for gas blowback guns. It's a soft compound, which suits the lower pressure of green gas pistols and rifles, especially in cold weather where pressure drops. Compared to a standard AEG bucking, it's shaped and compounded for the faster, less even pressure of a gas action, so it grips and seals the BB through the cycle. Fit it square with no twist, since a bucking nicked during installation won't seal properly.