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You have to put the rubber on the end of the barrel BEFORE trying to insert the assembly.
Because the little nub that cause hop-up needs to be in the groove on the barrel, otherwise, it won't fit.
You can go slowly, and move back a forth a little bit to place the rubber correctly.
Then, insert the bucking, the little plastic lever and the adjustment nob.
You only have left to clip the holder in place.
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