Unicorn Airsoft
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Unicorn Airsoft's 60 degree AEG hop up bucking is the middle of the rubber hardness range, a sensible default for most AEGs. It grips a BB well at moderate pressure to work with the springs most guns actually run, yet stays firm enough to hold its shape under the hop arm rather than distorting, which is what keeps a setting stable across a day of shooting. It's the one to fit when replacing a worn bucking if you don't have a specific reason to go softer or firmer. Seat it square with no twist and confirm the nub presses evenly.