Pg. 23 of Bullets and Bandages

The drone is listed as having snake fingers.
I can not find that in my SR5 books. Is this an upgrade in SR4? If so what's it do?

Chrome Flesh, pages 88 & 90

Thank you much.
It has been a good read. Don't know how I missed this book.
Loved the section on street doc's. Now I need to revisit Karla and change one of her complex forms.