When opening sunroof it catches on the rear of the roof and makes a loud bang is there any adjustments for this

Sounds most likely like a concern with the moonroof track. The track may have an issue or a restriction. Look closely for anything out of place and inappropriate in the way of the glass travel. Most moonroof concerns like this require track / frame replacement. Hopefully this isn't the case! Have a trained technician near you have a look to inspect and resolve the concern. www.repairpal.com/repair-shops