I have an HK bi-pod up for sale. I think I had installed maybe one time. It is not the heavy one, but it is not the cheap one with plastic feet either. It is heavy steel. I will try and get a picture up, but I can email or text one out for you. These are not cheap when you can find them.
$235 shipped OBO.
Will consider FTF in East Bay area.
$235 shipped OBO.
Will consider FTF in East Bay area.