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Old February 16th, 2009, 12:54   #3
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Join Date: Jul 2003
Location: Ottawa, Ont.
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There's likely a plastic C-clip that holds the hop up and barrel together, or a pair of screws holding it together. I installed one once like two years ago, and can't remember that exactly the 552 has for a connection, but if you yank it too hard or try to force it, you'll break the hop up and good luck finding a replacement for it.............. at least one that isn't still attached to another 552.

And want to know what happens when you screw up the part that holds the hop up unti and barrel together? You will either get double feeding and very low fps from the airleak between the rubber and the nozzle, or worst case, your inner barrel will literally fly out the front end and onto the floor (happened to an Armalite I was workign on one day, the owner had forgotten to put the clip back in).
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