When installing the bucking on the barrel, just rotate it as your putting it on and it should slip on just fine. When putting the barrel with hopuprubber into your hopup chamber grease the outside of the rubber and rotate as you push it in, there shouldn't be any resistance.
If you grease the inside of your hopup rubber it loses its grip on the BBs and you won't have any hopup effect until you've shot enough BBs to dry the rubber.
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