The Origin was my first PCP and I opted for the complete kit. At the time I ordered it there was no "rifle only" option but even if there was, I would still have bought the full kit. Dealing with separate sellers, waiting for this and the other to arrive... I ordered from Umarex and it came in a few days, double boxed, no fuss, no muss.
The pump that came with mine was a hot pile of garbage. Rebuilt it several times an never got more than a fill or two. And yes, I would give the pump time to cool after 50 strokes or so. The last time I rebuilt it I looked inside of the final stage bore and saw it was never polished.