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QB78/79 also known as the SX78/79

Posted: Sat Jan 24, 2009 7:18 am
by Dave_424
Hey, I am interested in buying this air gun just as a cheap garden plinker. Has anyone had any experience with them?

I would buy a bulk fill adapter and use a co2 remote coil to get more shots and it is MUCH cheaper than the 12g powerlets

also, could I fill the gun to around 600psi? what amount of performance decreace should I expect (I think that it will be terribly poor)

Dave

Posted: Sun Jan 25, 2009 1:00 am
by jor2daje
I have a spring rifle, a c02 pistol, and a diasy plinker. My favorite by far is the daisy, its pretty weak but it hold 400 rounds and doesn't require any c02. But if you want a more power I would go for a springer, they are slower but very powerful. I would recommend against a c02, even with a bulk adapter I never use my co2 pistol. Even with the large tank you still need to fill it up, and it always seems to run out at just the wrong time.

Posted: Sun Jan 25, 2009 8:14 am
by Ragnarok
I have to admit, I have no personal experience with the QB78 or 79, so what I have heard is just through reading other people's opinions. However, I'm reasoning that's better than nothing.

I have not heard of anyone that bought one as a plinker and was disappointed. (However, buy it for hunting, and you will be, they're only about 6 ft-lbs) In fact, I get the opinion that most people are entirely happy with them.
Could I fill the gun to around 600psi? what amount of performance decrease should I expect?
Now this is just a guestimate based on my experience with pneumatics - and because I don't know about the valve system involved, it's not guaranteed to be right - but expect to lose about 1 ft-lb, possibly slightly more. How much you lose will be dependent on temperature.

It should be noted that on the upside your rifle will gain consistency from being regulated as such.

Actually, all of this reminds me of some musings of mine a while back I had about buying a cheap CO2 plinker (possibly a Nightstalker) and trying to tune it up to make a decent rifle out of it.

Posted: Sun Jan 25, 2009 1:15 pm
by frankrede
Ragnarok wrote:I have to admit, I have no personal experience with the QB78 or 79, so what I have heard is just through reading other people's opinions. However, I'm reasoning that's better than nothing.

I have not heard of anyone that bought one as a plinker and was disappointed. (However, buy it for hunting, and you will be, they're only about 6 ft-lbs) In fact, I get the opinion that most people are entirely happy with them.
Could I fill the gun to around 600psi? what amount of performance decrease should I expect?
Now this is just a guestimate based on my experience with pneumatics - and because I don't know about the valve system involved, it's not guaranteed to be right - but expect to lose about 1 ft-lb, possibly slightly more. How much you lose will be dependent on temperature.

It should be noted that on the upside your rifle will gain consistency from being regulated as such.

Actually, all of this reminds me of some musings of mine a while back I had about buying a cheap CO2 plinker (possibly a Nightstalker) and trying to tune it up to make a decent rifle out of it.
I had the Crossman Nightstalker for a while and it shot great, my only complaints were the tendency of the mags to jam in the gun and the near impossibility it was to remove them.

Posted: Sun Jan 25, 2009 5:21 pm
by Dave_424
Thanks for the info guys, I have read MANY times that people are getting 10 ft/lbs from the box

This can be easily made up to the legal limit (Or even more in some cases) just by dismantaling, de-burring all of the machining that looks like it has been done with someones finger nail :P and polishing the cylinder and other parts

there are higher flow valves, kits to run it at PCP pressures and other mods that are good for people to tinker with. :)

I have found out that I can get big bottles of co2 (About 3 foot high) for £10.... yes ten pounds!! so with the bulk fill adapter, a remote line, a sodastream bottle (£14, much cheaper than a paintball co2 bottle) and a filling station and I'm all set

Dave

Posted: Sun Jan 25, 2009 5:38 pm
by Ragnarok
Dave_424 wrote:Thanks for the info guys, I have read MANY times that people are getting 10 ft/lbs from the box.
The stores I know of that sell them report them as "around 6 ft-lbs" - although I guess the potential depends on the calibre.

I can't be certain, but I have to express my doubts you'll get 10 ft-lbs from it straight from the box.

Posted: Sun Jan 25, 2009 5:45 pm
by Dave_424
just a quick question what would I get more shots from .177 or .22? I thought the .22 but wasn't 100%

Posted: Sun Jan 25, 2009 6:01 pm
by Ragnarok
For the same muzzle energy, .22 has a better shot count.
Equally though, .22 pellets cost around twice as much, if not more, so if money is a consideration, remember that as well.

Posted: Sun Jan 25, 2009 6:02 pm
by Dave_424
yeah, .22 it is then, I have always used it for a hunting calibre