Unicorn Airsoft
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Unicorn's GBB 70 Degree Hop Up Bucking is a firm rubber hop-up for gas blowback rifles and pistols. That firmness is the point: a 70-degree compound holds its shape against the higher pressure a healthy gas system produces, which keeps the backspin consistent from shot to shot instead of distorting with each cycle. It also grips heavier BBs better, since they need more contact to take the same spin. Fit it square on the barrel window and make sure the nub above presses evenly across the contact patch.