QB Project

[larspawn]

Today was the QB day and I shot the QB78D tuned by MM and the QB78 tuned by me.  The MM rifle in .22 shoots 720 fps!  My .177 shoots about the same.  What black magic does that man do to these rifles?

I think that the stock QBs are too short of LOP and too barrel light.  Putting a RFM shroud on the MM rifle helped and if you look at the picture of the one I tuned you can see I put an RWS brake (slightly modified by me ;-) ) and a spare AR2078 barrel weight.  I think doing that on both helped the balance.  But the QB79 with the 9oz tank is even better.  I think it makes for a very well balanced rifle.  I'm digging it so much I think another is on my short list.

Hope you enjoyed the thread as much as I enjoyed doing this project!

Andy Wong aka larspawn

[larspawn]

Okay I just bought a Tippmann collapsible stock on eBay for $12 shipped.  I couldn' resist a deal.

My idea is to see how I can fabricate a pistol grip and collapsible stock.  Of course it will be in bedliner black since I have the rest of the can of Duplicolor. I'm trying to think of a way to make an "AR" looking stock with a top carry handle.  Might be too much fabrication but I'm going to think about it for a few weeks.

Andy Wong aka larspawn

[ronbeaux]

OK, call me stupid. But I see a brass looking fitting between the bottle and the reservor. If I unscrew the cap on my 78 and screw on a bottle I can't think of a way that the c02 would get in there. There must be a replacement cap for the original that will allow the bottle to empty into the chamber.

Please forgive me. Spring guns I know. These I don't.

[larspawn]

Ronbeaux,

You must have a QB78 which is either carts or bulkfill.  This is a QB79 which is made for bottle.  I does not have the gas tube like the 78 but instead it has a gas block.  That is the squareish looking thing on the end.  The 79s are thus much shorter in forestock than the 78s.  

Yes the brass part is the valve on the bottle.  I should have painted it too.  Maybe later.  So on mine I have to screw the bottle in and then place the action in the stock because there is no room for the burst disk to spin.  That is why in the pictures you can see I grooved out the bottom of the forestock for burst disk clearance.  Luckily removing the action from the stock is very simple on the QBs.  Even simpler if you disable the safety, which I don't.

BTW the other two in my last picture are QB78s on bulk fill.  I can either charge and go (about 20-30 good power shots) or use a paintball remote with a separate bottle for many more shots.  I just don't like having the coiled hose and bottle strapped in a fanny pack.  The hose tends to make holding aim harder.

Hope that helps.

Andy

[ribbonstone]

Had to use a Talon SS, but it’s definately ARish.

[larspawn]

That is crazy cool.  Okay now I'm convinced I need to do something like this.  So what is in the mag?  Is it just for looks and how did you attach it?  

Thanks for sharing.  At least it confirms I'm not the only one 'out' there!

Andy Wong aka larspawn

[ribbonstone]

Mag stayed on for about 10 min....decided that  having my neighbor call the police and getting shot by a SWAT team wasn't going to be real productive.  I'd advise you of the same thing: make them look real enough and you're likely to be treated as if they are....not healthy.

Mag is a plastic dummy mag from my nephew's air soft, held on by an interna; screw (using one of the Talons existing screws) and a hidden "tab" locked in place by the fore arm.

[larspawn]

Hmm, good point. Unless I want to paint the tip orange I should stay away from making it too realistic.  Okay just going to go with a pistol grip and the adjustable stock.  Got some ideas brewing in my head.  Just have to look for a donor action.