tube to the QB is probably the 160 crosman. However it is pretty much the same length as the QB, so no capacity gain.
When I built my QB78 carbine, I wanted a full length lower tube to match the new barrel length, and add to the co2 capacity. I just bought a pc. of 4130 tube and made up a longer one pc. lower tube. Most of the work could be done with a drill press and a Dremel and some practical knowledge. The alternative would be to buy a lower tube made to your length from one of the tuners (Rich n Mich, Jack Haley etc.)
I found the gain in shot count well worth the trouble.
Anthony
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