Recently, we've had a few calls asking if the QB79 can be used with a 9-ounce paintball tank. So, here's the straight scoop on this topic...
The QB79 was designed to be used with 9-ounce paintball tanks. At that time these tanks were made from steel and had an outside diameter of 2.00 inches (maximum). But, 9-ounce tanks manufactured since about 2007 have been made from alloy, with a larger outside diameter closer to 2.25 inches.
The result is that current and recently manufactured 9-ounce CO2 paintball tanks do not fit the QB79. At least, not without a little help
This is why I designed the Archer Airguns Paintball Tank Adapter for QB79. The adapter simply screws into the tank block of the QB79. The 9-ounce tank screws into the adapter. It's simple, easy and allows QB79 users to use 9-ounce paintball tanks without compromise.
You can see it at http://www.archerairguns.com/Archer-Airguns-Paintball-Tank-Adapter-for-QB79-p/qb79tankadapter.htm
We also sell the QB79 complete with 9-ounce CO2 tank and adapter as a bundle http://www.archerairguns.com/QB79-Air-Rifle-Bundle-p/qb79bundle.htm
Alternative solutions to this issue have appeared in the past - such as the breech spacer products sold at one time by JRA. While this obviously provides increased clearance, it has the disadvantage that the factory barrel band can no longer be used as the breech is now higher on the gun. The result is that the barrel is supported only by the breech setscrew and accuracy may suffer as a result. This problem does not occur with our adapter due to its unique design.
I hope this information is useful to those who have concerns about this topic.
Archer Airguns Inc.
Online stores http://www.archerairguns.com