Be careful with the hop up rubber. There are 2 things that can happen and has happened to me:
Forced it out because it was literally stuck there so it got stretched out and now it won't fit.
Lose the Hop-up rubber and your done for unless you get a new one. It's a TEENY TINY bit of piece that practically runs your hop up, without that = no hop up.
That's about it, other than that it's not so hard.
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