With the revised section of Nuts and Bolts Volume 9, published in 2010 the publisher has brought up to date the 7,5 cm Pak 40/4 auf gep. Selbstfahrlafette Raupenschlepper Ost RSO. This included new drawings, additional historical photos and text; and assisted those modelers who purchased the new Dragon kit 6640. However under 100 vehicles were produced, whilst it's sisters the RSO/01 and /03 saw over 27,000 units manufactured. With a vast amount of information and Lutz Konetzny's outstanding historical photos the team decided this was an essential addition to the series. With an outstanding historical section, supported by museum vehicles, scale drawing and accurate camouflage renditions we are confident that this will be one of our most popular issues. This issue should also be especially welcome for the AFV modeler, as Dragon Models have now released their RSO/01 & 03 kits.