Dual bladed walk power mower with rear bagging mode

A walk power mower has a mower deck that encloses a pair of rotary cutting blades with the grass clippings from the blades being discharged through a rearwardly extending grass discharge tunnel in a rear bagging mode of operation. The pair of cutting blades rotate in the same direction relative to a cutting chamber of the mower deck so that grass clippings cut by one blade merge with grass clippings cut by the other blade with the merged clippings forming a single common stream of clippings that is rearwardly directed along one side of the cutting chamber. The clippings enter a grass collection bag which is positioned between the handle tubes of a handle assembly of the mower.