The JP Enterprises High Pressure Enhanced Bolt Assembly is compatible with DPMS LR-308 pattern rifles and BCG's. So it should work fine with an Aero Precision M5 BCG.
The JP Enterprises High Pressure Enhanced Bolt Assembly is compatible with DPMS LR-308 BCG's. So it will work with a DPMS pattern Adams Arms BCG.
Yes, this bolt could be used with 6.5 Creedmore.
Yes, this would be compatible with that bolt carrier. You would still need the cam pin to install this into the carrier. They sell a different kit that includes it: J5-BCG-VCXE-JPBC-EB308HP