Scheme -
http://www.liveguns.ru/files/guns/HK_P9S/hk_p9_cut.jpg

Exploded diagram and parts list -
http://www.asamnet.de/~ehrenred/ersatzt/hkp9s.htm

Parts -
http://www.hkparts.net/shop/pc/HK-P9-Parts-c232.htm
http://small_arms.academic.ru/pictures/small_arms/hk-p9s-3.jpg
http://www.hkpro.com/p9roller.jpg
http://i160.photobucket.com/albums/t161 ... inside.jpg

Manual -
http://stevespages.com/pdf/hk_p9s.pdf