Loose Barrel on my Kalibrgun cricket 2

Welcome to AGN.

First thought that is coming to mind about the way you describe this. Are you sure it is the barrel which is loose? Could it be the barrel shroud which is unscrewing with the modertator and not the barrel itself? There is a shroud over the barrel which give some noise reduction and that is what you are mounting the moderator too.

If you can post a pic that would help a lot.
 
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