QB78 Question!

[parkerd]

I don't know if this is the right place to put this but this gun is CO2 so I think it make's sense!  Anyway's could you take the QB78 with the .22 barrel and install a .25 barrel!? I wan't a bigger/heavier pellet... If I can do this I will go with the QB79 so I have a lil more FPS.. I'm still very much a novice when it come's to modding airguns. So if you could explain it into terms a idiot can understand! "Air rifle modding for dummies!"  Hope ya'll can help!



                                               -Parker

[SAADE]

In theory yes, you will need to find a .25 cal barrel with the right O.D. (15mm I think) and you will also need to machine/mill the breech end of the barrel to accept the QB o-rings and to mimic the breech shape where the pellet/bolt probe goes in. All precision machine work, not complex, but precise. And... there is a gas transfer port that needs drilling into the lower side of the barrel too.

Maybe someone on here has actually done it to a QB?

[parkerd]

Whoa!  I don't have any of that stuff... haha I guess I will just buy a new gun once I get the money for it! 

[SAADE]

email Mike Mellick at Flyingdragon airguns and ask him about it, he's the pro.

[Rescue912]

The machine work is really pretty straightforward. I put a shortened .22 caliber marauder barrel on my QB in about an hour. I am guessing the .25 would be similar. You will have to do something with the breech and bolt too though, the .22 bolt & o-ring isn't going to seal that .25 hole