My PPC without full underlug has Hogue grips (I didn't purchase new, so not certain what it came with from the PC). I have seen several other pics of PPCs without the full underlug that also have Hogue grips.
My other two PPCs have the factory hard grips.
Quick sidebar--I thought I had read that PC PPC pistols did have screw bushings on their frames (e.g., to accept Nill grips).
I have never pulled the grips on my PPC pistols to check.