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PostPosted: Sun Apr 26, 2009 6:15 am 
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Joined: Thu Mar 29, 2007 9:56 am
Posts: 85
I was using my QB78 all winter and I started to wonder, because of the negative results, about this rifle and turning it PCP and if I could even do that. Then I decided to think along the lines of just putting the right connection on the end of the bulk cap then connect it to my garage compressor. Would that kind of scenario work in any configuration or not? Does anyone have any experience with anything along this line at all? I don't want or need another rifle because I just won't use another rifle and I find more than what I want or need is simply waste. I know, I'm on an air gun forum spouting blasphemy :twisted: and I should be banned for that thought and statement. I do covet another secretly though :oops: . I want the AR2078 and I really am trying to justify it to myself but it’s a struggle, and I think I’m starting to win and might end up getting it real soon 8) . For now, and even if I get the AR2078 because they are the same, I’m looking at alternate power sources for this rifle. I would be interested in any variations and their success or failure please. I also want to add that if anyone has a used AR2078 for sale I would be interested in talking and would like to avoid buying new at those costs.

Thanks, Eastcoast Shooter


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PostPosted: Sun Apr 26, 2009 6:55 am 
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Location: Oshawa, Ontario
a regular shop compressor WON'T work, the AR uses co2, which has a pressure around 800-850psi, a shop compressor will max out around 150-200psi. there are compressors out that will produce up to 3000psi, but they will run you up to $4000.00.

GT

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PostPosted: Sun Apr 26, 2009 6:56 am 
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Location: Cochrane, Ontario Canada
When you run your QB on the intended gas, C02, you are projecting your pellet with 850 to 1000 psi of pressure. Your shop compressor, depending on what you have, will put out 125 to 175 psi.

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PostPosted: Sun Apr 26, 2009 7:18 am 
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Thanks, that's clear enough to understand. What would I have to do, if anything to allow me to use both CO2 and compressed air? That is if I could some how be able to get the correct method to deliver the air first of all. I'm just spit balling some thoughts right now and trying to get my ducks in a row so I can decide if it's worth the effort or cost to me right now or if I should just stay with the CO2 since I don't really use it that much in winter and generally then it's right off my back deck. So then I can just duck in more often and warm up the rifle if I did want to shoot for longer periods.I live on the east coast though, so some days just opening the patio door causes everything to freeze instantly. It goes something like this on those days,.... I open the dooor and I think it's the north wind screaming, but it's only my wife telling me she says I'm nuts if I think I'm gonna stand in that doorway today and fire at that target even once today in this bitter cold"do you think I'm heating the entire street" sometimes I think I married my mother and I'm still 8 years old :cry:

thanks, eastcoast shooter


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PostPosted: Sun Apr 26, 2009 7:56 am 
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Location: Wilkie, SK
Quote:
What would I have to do, if anything to allow me to use both CO2 and compressed air?


I'm going to assume that you want to run on carts in the summer and HPA in the winter. If so, you should probably contact SNIPER and look at a tube extension and an endcap. the endcap will need a Foster filling and you will also need a pump or a souce of air (SCUBA tank and regulator to prevent over pressuring the tube). All in all, a fairly expensive project.

For winter:
Tube extension - 55.00
Endcap & fitting- 45.00
Pump witn guage and fittings - 150 used - go up from there for new.

For summer - remove the above and go back to carts.

Remember though - this will be a non-regulated HPA setup and you will lose pressure/MV on each shot ...... so this will effect target shooting. the gun 'can' be tuned to provide a fairly reasonable shot string but there's a whole bunch of playing around and experimenting with springs to get there.

There are guys out there that do this kind of tuning. About 100.00 plus postage both ways will get the job done on the gun........but you will still need a pump :cry:

I think SNIPER has done a number of these conversions - might be an idea to contact him and see what he thinks.

Cheers - Gus

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PostPosted: Sun Apr 26, 2009 12:52 pm 
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Location: Scotland,Ontario
I have an oxygen tank for my torches,would that work the same as a scuba tank.

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PostPosted: Sun Apr 26, 2009 2:42 pm 
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topher1266 wrote:
I have an oxygen tank for my torches,would that work the same as a scuba tank.


NO, NO, NO,,,, if you value your life DO NOT use oxygen,,, EVER,,, in an airgun.

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PostPosted: Sun Apr 26, 2009 3:46 pm 
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Location: Rocky Mtn Hse Alberta
topher1266 wrote:
I have an oxygen tank for my torches,would that work the same as a scuba tank.


Perhaps enroll yourself in a welding safety course. You missed something in your training.

Walter...

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PostPosted: Sun Apr 26, 2009 5:04 pm 
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Joined: Thu Mar 29, 2007 9:56 am
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I'm not sure, but I believe, oxygen under pressure equals heat equals explosion or at the very least fire, but in an enclosed space fire equals ..... again explosion.
thanks everyone for your input on my question. As always wehn I ask something in here, I get quite good advice and a large number of helpful suggestions.

thanks, eastcoast shooter


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PostPosted: Sun Apr 26, 2009 5:49 pm 
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Location: Scotland,Ontario
I'll use my Co2 tank with a filter to fill my 9oz tanks.

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PostPosted: Mon Apr 27, 2009 1:12 pm 
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topher1266 wrote:
I'll use my Co2 tank with a filter to fill my 9oz tanks.


I have two 20 pound CO2 tanks that I use for welding, paintball markers, and carbonating my brew.I also now use it to fill my QB78 from the 9,14,and 20 ounce tanks that I use for paintball markers. I use a digital postal scale that I use to make sure I don't overfill. I weighed each one of the tanks when empty and then just added up to the total fill capacity of each one and I could tell how much each one needed even if it wasn't already empty. This way I didn't waste any CO2 and didn't get my self into a dangerous situtation. I found that if I freeze the smaller tanks first that they took the CO2 more easily. I also cool down the fill tube on the QB78 with ice packs prior to filling that as well and this made it easier to fill to capacity. The fill station I bought for the 20 pound CO2 tanks and the digital postal scale long since paid for themselves with what I saved by doing my CO2 this way with my air rifle and my paint ball markers, you just can't beat that kind of economy and the convenience is as good as it gets since it's there when you need it anytime.

L8R, eastcoast shooter


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PostPosted: Tue Apr 28, 2009 11:49 am 
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I attached a nipple to an empty co2 bulb and then tried firing the thing from a compressor... the pellets had a hard time leaving the barrel :lol:


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