Help! I need someone to help calm my airsoft paranoia!

So I recently got my first airsoft gun a (specna sa-b01) however I can't help myself from trying to find imperfections in it, one of them being when I shake the rifle (and holding down all lose external bits like sling mounts) I can here a clunking sound from inside the gun, should I be worried? Or is it just my mind over exaggerating it and its nothing to worry about, I just need help being reassured in my purchase, if anyone else out there has also got a specna sa-b01 please give me your opinions thanks.

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P.s. Confusing post....Ik