Running HP on the speed 06 , G7, G7 flys is possible if the mini reg mod is done correctly.
some Angel owners on AOG have used HP in there LP Angels, but are finding it hard to get the velocity down below 300 FPS.
I have heard rumours , not fact ,that long term using HP on a LP Angel will wear internals very quickly.
These markers were made to use LP, advise is to stick with LP air.