Author Topic: $6 worth of CO2 went bye bye  (Read 1545 times)

steveoh

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$6 worth of CO2 went bye bye
« on: February 05, 2017, 02:32:20 PM »
Got scope remounted on my QB79, and then screwed in a freshly filled CO2 bottle.

Pfffffffffffffft, and it all leaked out from under the breech. Damnit, I hate it when that happens.




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Christopher

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Re: $6 worth of CO2 went bye bye
« Reply #1 on: February 05, 2017, 03:11:32 PM »
Fa-Rosty!!

That's gotta suck.

Chris
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Monkeydad1969

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Re: $6 worth of CO2 went bye bye
« Reply #2 on: February 05, 2017, 03:29:06 PM »
lol... ;D
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lloyd-ss

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Re: $6 worth of CO2 went bye bye
« Reply #3 on: February 09, 2017, 05:26:28 AM »
Steveoh,
Frustrating when something like that happens, especially if it is "user error" in one of those "Ouch, I can't believe I just did that," situations, LOL.  I certainly have a ton of those.  Nice looking gun with the requisite hand me down bath towel under it.
I don't have much (hardly any) experience with CO2, but I have a pair of older FEG 01 10M target pistols that I am refurbishing now. They accept both the 12g powerlets and bulk fill, but both methods have been very difficult to master, and I am more frustrated than anything else. Either I must be doing something wrong (most likely) or the CO2 methods on this gun are awkward. I take it that normally, using CO2, if done properly, should be fairly easy?
Thanks,
Lloyd-ss
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steveoh

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Re: $6 worth of CO2 went bye bye
« Reply #4 on: February 09, 2017, 09:14:41 AM »
I have not had any problems with this other than the breech seal crapping out, twice. Interesting thing about this rifle. I bought it maybe five years ago. I had ordered a new QB78 but instead was shipped the QB79. Told the seller, how about I just keep this, and call it even since shipping would kill any price difference. He agreed. I kept it and had a lot of fun. It was at the time super accurate and it had serious bark when I shot it.

In hindsight I now realize this rifle had a tune. How much I don't know. I do know that the .177 probe was not stock and it had the drill bit mod. Also it looked like the barrel part that sticks into the breech had been worked on. I recall seeing file marks that did not look like the normal crude machining these airguns come with. I wonder why the seller did not mention this.

Back to the original time the seals failed. The fellow who sold me the QB79 said to send it back that bad seals would be covered under warranty. Cool,  I sent the gun back and in short time got it back. I shot it a dozen or so times, and it did not have the old bark, or accuracy. I was puzzled, but by then I was already looking at PCP's and this gun got stuck in the cabinet and I mostly forgot about it.  Have shot it here and there over the past few years but still I was confounded why it no longer had the power it once had.

So when I pulled the gun apart last weekend, I started noticing things. The Probe no longer had the drill bit mod. Rather it had the hollow probe that had been monkeyed with a little. And the barrel where it fits in the breech no longer had the file marks. It does have the ice maker tube mod, and the valve appears to be not stock.

I have a 12g powerlet adapter and it works fine, but I mostly use old CO2 screw on tanks (9ci ?) that I've not had a problem with. I just keep fresh seals on them and keep them lubed up.

I will reseal the rifle and while I'm at it I think I'll take a shot at the drill bit mod for the probe, and enlarge the port on the barrel a bit.  Going to see if I can't do some polishing in the areas that are hard on the orings.

Still wondering why the seller swapped out the probe and barrel when he resealed. I recently asked him, and he says he has no recollection. Maybe I got a completely different rifle back, or maybe he thought I paid for a stock rifle and he decided to bring the rifle back to stock. I don't know. At any rate I've moved on, and he no longer sells these rifles. But Big5, Pyramyd, and AirgunDepot do sell them, and they are still cheap. And now that I've completely stripped my QB79, I no longer fear diving it. Pretty damn simple stuff.


Steveoh,
Frustrating when something like that happens, especially if it is "user error" in one of those "Ouch, I can't believe I just did that," situations, LOL.  I certainly have a ton of those.  Nice looking gun with the requisite hand me down bath towel under it.
I don't have much (hardly any) experience with CO2, but I have a pair of older FEG 01 10M target pistols that I am refurbishing now. They accept both the 12g powerlets and bulk fill, but both methods have been very difficult to master, and I am more frustrated than anything else. Either I must be doing something wrong (most likely) or the CO2 methods on this gun are awkward. I take it that normally, using CO2, if done properly, should be fairly easy?
Thanks,
Lloyd-ss
« Last Edit: February 09, 2017, 10:05:27 AM by steveoh »
  • Benicia, California
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lloyd-ss

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Re: $6 worth of CO2 went bye bye
« Reply #5 on: February 09, 2017, 10:30:29 AM »
Steveoh,
Thanks for the additional info and pics.  Are you sure that mice haven't been nibbling on those o-rings?
There is definitely a lot of satisfaction with taking a gun that has a lot of "opportunity for improvement," and actually fixing all those little problems and turning it into a really nice gun.  I know there are lots of folks that want the gun to shoot perfect the first time out of the box and that is fine, too, but giving it a personal touch really adds something to the enjoyment.
Good luck on getting the 79 in top notch shape.
Lloyd
 
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rsterne

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Re: $6 worth of CO2 went bye bye
« Reply #6 on: February 09, 2017, 10:33:27 AM »
Not mice, Lloyd, but sharp edged factory holes for the tank block mounting screws, and the setscrew that hold the barrel in place and the transfer port hole in the receiver.... Deburring of QBs is the very first order of business, IMO....

Bob
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lloyd-ss

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Re: $6 worth of CO2 went bye bye
« Reply #7 on: February 11, 2017, 07:07:27 AM »
Not mice, Lloyd, but sharp edged factory holes for the tank block mounting screws, and the setscrew that hold the barrel in place and the transfer port hole in the receiver.... Deburring of QBs is the very first order of business, IMO....

Bob

I remember a blog that Tom Gaylord wrote a long time ago where he said that some of the Chinese guns were made crudely enough so that they would just barely work.  There is a lot of truth to that.  But then again, I have a B40 (TX200 knock off) that is a very pretty and fairly well made gun, except that a pellet will fall right thru the barrel. :(  Sigh.
  • Ivy, VA
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steveoh

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Re: $6 worth of CO2 went bye bye
« Reply #8 on: February 27, 2017, 02:06:31 PM »
Took the QB79 apart two weekends ago, and smoothed / polished out everything I could reach. All new o-rings, refrigerator tube hack for transfer port seal and put it all together. I was amazed that it appears to be holding air.  I had thought about doing a performance tune on it, but decided to just clean, polish and reassemble first. Will see if I can't do a tune coming up soon. It's still not as accurate as it once was, and I am convinced that when I sent the gun back to so and so, that he swapped out the barrel and probe at the very least. I've learned my lesson there.

Anyway, I may just order up a .22 barrel and modify this probe for 22, and move on. Until then I'll examine the bore and crown of the current .177 barrel. Maybe it's something simple.

Steveoh
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