The inner part of the knob for my marruci baseball bat popped out. should i return it?

The CAT 5 is just a straight up, 1-piece aluminum model. The pitch from Marucci is that a bat with less vibration on impact, will boost confidence in the hitter, producing a more powerful swing. It uses something called Abin Harmonic Dampening, to eliminate harmonic vibration caused by off-center hits.