Barrel loose on Boba Fett blaster from Master Replicas?

I bought the blaster straight from MR and having gone through the most trying process of having problems fixed with my Jango Fett blasters (replaced after three tries to rectify the faults) I simply asked MR how the Fett blaster breaks down. Their last reply was "We've ordered the blueprints". The reason was that the barrel part is slightly loose and will wiggle a bit up and down. Has anyone taken apart theirs? Is there some screw to fasten? It's mostly metal so I would imagine it's not glued...?