KoolAidMan the accuracy is as good as a stock TM G36C, after seeing its performance on the field I'm definitely very impressed.
Solo36 externally and internally the JG G36C mechbox is compatible with both TM and CA so yes if you did "destroy it", you could replace it with a CA no problem.
HeReigns yes undo the small allen key screw on the bottom of the flash hider and it screws right off. You don't have to replace it, you can strip the orange paint and repaint it black.
Not sure how much a replacement flash hider is, my friend repainted hers quite well.