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If "A" is the end the BB enters the barrel, and "D" is the end of the barrel that the BB leaves the muzzle, then:
A - Rubber - Plastic ------------ B
Install the rubber and bucking on to the barrel and in to your hop up chamber as normal - leave the hard plastic piece out for now.
Once assembled, use the brass installation tool to push the hard plastic piece all the way down the barrel starting from the muzzle all the way to the chamber and have it sit so that the edge of it is flush with the gap where the barrel clip enters. Then attach the barrel clip.
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