Another beginners question ?

Joined: November 14th, 2015, 5:30 pm

January 13th, 2016, 10:07 pm #1

Can you turn your QB78 to a 79 series ? Must I have a whole new tube or is their a modification that is available !

Big 5 is having a sale right now on Beeman Deluxe QB78's for $99.99 minus 10% ! Who could not use another QB78 at that price ? but would love to convert it without going NUTS !

Just wondering, or should it be left like it is ? I already have a QB78 Deluxe and I really love it, I still want to keep it CO2 but a larger tank, even adaptable to 88g would be fine !

wll2506
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Joined: November 17th, 2006, 3:51 am

January 13th, 2016, 10:27 pm #2

Would have to cut off the end of the QB78 tube (there are reasons to get rid of the threaded end cap part, add a QB 79 tank block (which aren't always available and cost), drill and tap the new cut off tube for the QB 79 tank block retaining screws (and be sure you got them in just the right place).

End up with a tanker QB with a longer than QB79 air tube...which is of absolutely not help (but no hurt) for co2 use. Is a help for HPA use.

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Joined: November 14th, 2015, 5:30 pm

January 13th, 2016, 11:22 pm #3

Then best bet is to keep it as a CO2, maybe add a bulk adapter end cap and just shoot it CO2 ;- )

I have trouble passing up a good deal on a QB ... it is like I have a disease !

wll2506
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Joined: May 25th, 2013, 11:52 pm

January 14th, 2016, 1:02 am #4

Can you turn your QB78 to a 79 series ? Must I have a whole new tube or is their a modification that is available !

Big 5 is having a sale right now on Beeman Deluxe QB78's for $99.99 minus 10% ! Who could not use another QB78 at that price ? but would love to convert it without going NUTS !

Just wondering, or should it be left like it is ? I already have a QB78 Deluxe and I really love it, I still want to keep it CO2 but a larger tank, even adaptable to 88g would be fine !

wll2506
I went back and can't find your Email address Will2506 Send it to me and I might have some parts you can use. better yet your phone number mine is 760-948-1630.
Thanks Tom Mace
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Joined: November 14th, 2015, 5:30 pm

January 14th, 2016, 2:44 am #5

Thank you,

wll2506
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Joined: June 24th, 2010, 2:44 pm

January 14th, 2016, 6:54 am #6

They aren't going anywhere no time soon. The 78s are capable of more power output than the 79 due to more prevalve volume so put a bottle on it. Looks strange at first but its worth it if your power hungry.
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Joined: November 14th, 2015, 5:30 pm

January 14th, 2016, 5:26 pm #7

Unless I cut the main tube and do all kinds of modifications from what I have heard. I may just turn her into a bulk fill CO2 ;- )


wll2506
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Joined: March 11th, 2014, 1:20 am

January 14th, 2016, 5:28 pm #8

you can reverse bottle with just a few fittings n/t
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Joined: June 24th, 2010, 2:44 pm

January 14th, 2016, 5:54 pm #9

Unless I cut the main tube and do all kinds of modifications from what I have heard. I may just turn her into a bulk fill CO2 ;- )


wll2506
All you need is the tank block. And while your at it upgrade the screws that secure it for something harder for peace of mind. Should be able to buy the block from Archer or JDS. Do a search here for 78 with bottle and I'm sure you'll get more information. On another note, my friend shoots his 78 with 1500psi in the factory tube with a bulk fill cap. Not a lot of shots but big gains in velocity.
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Joined: November 14th, 2015, 5:30 pm

January 14th, 2016, 6:14 pm #10

It is just the machining that scares me !

wll2506
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