Disassembling inner barrel from hop up

[Stealthee]

UPDATE: I figured it out, but thanks anyways.

Hi everyone, I need help on disassembling the inner barrel from the hop up unit on my KSC USP Compact (System 7). I have never done this before and I am not sure what to expect. Does anyone know what to do? There's a screw somewhere on there but I haven't tried loosening that yet.

Note: I will post up a picture of it later for reference. Thank you all.