Hi,A number of years ago I purchased an AR2078B. It worked great for occasional usage. However, after some time of not using it, I tried loading a new CO2 cartridge and it started leaking through this area denoted by the blue arrow:How easy is it to fix this, and what specific part would I need to buy to fix the problem?As an aside, for airgun repairs do you normally ship them somewhere, or are there typically locations you can drive to to have them fixed up?Thanks!
Quote from: gunnewb on June 13, 2022, 06:11:19 PMHi,A number of years ago I purchased an AR2078B. It worked great for occasional usage. However, after some time of not using it, I tried loading a new CO2 cartridge and it started leaking through this area denoted by the blue arrow:How easy is it to fix this, and what specific part would I need to buy to fix the problem?As an aside, for airgun repairs do you normally ship them somewhere, or are there typically locations you can drive to to have them fixed up?Thanks!If air only comes out when you fire it, then a small piece of 1/4" ice maker hose will fix it. If it's leaking out the gas after you pierce the cartridges, then it's either the exhaust valve or the o-ring at the valve. These guns are super-easy to work on and there are parts available. Youtube has lots of QB78 and AR2078 videos. Take a look and you'll find how to fix it.Luck,J~
Quote from: Goose on June 13, 2022, 09:37:17 PMQuote from: gunnewb on June 13, 2022, 06:11:19 PMHi,A number of years ago I purchased an AR2078B. It worked great for occasional usage. However, after some time of not using it, I tried loading a new CO2 cartridge and it started leaking through this area denoted by the blue arrow:How easy is it to fix this, and what specific part would I need to buy to fix the problem?As an aside, for airgun repairs do you normally ship them somewhere, or are there typically locations you can drive to to have them fixed up?Thanks!If air only comes out when you fire it, then a small piece of 1/4" ice maker hose will fix it. If it's leaking out the gas after you pierce the cartridges, then it's either the exhaust valve or the o-ring at the valve. These guns are super-easy to work on and there are parts available. Youtube has lots of QB78 and AR2078 videos. Take a look and you'll find how to fix it.Luck,J~Thanks. The gas leaks out the moment the cartridge is pierced.Where's a good place to get parts if needed? ^&$@_=s?
Thanks. The gas leaks out the moment the cartridge is pierced.Where's a good place to get parts if needed? ^&$@_=s?
After managing to get some parts I took apart the gun following some instructions online - but the instructions didn't quite match up with what I saw from a few videos. I replaced the breech seal because it looked uneven and a barrel o-ring which was torn (which might have been my fault) and was going to put it together.-Anyways, how do I reassemble the cocking lever? Which set of holes does it attach to?-Videos online show a hammer pin. However, I didn't see any hammer pin when I disassembled it.-What's the order the spring and other components go back into the gun? When I removed the screw for the end of the barrel those things popped out.
OK...so I finally found some time to work on it and I figured how to put it together (thanks to the help on this forum)So this variant is similar but not quite the same as the QB78, which is why I got confused when my disassembly didn't go quite the same as the videos I saw online. So here are the differences:* My bolt has two holes. I saw the picture kindly diagrammed by Goose and noticed there was only one hole in the QB78 diagram. I figured the second hole was there for a reason, so the cocking handle/arm thing goes into the smaller secondary hole on the bolt.* When I unscrewed the gun, the spring and other components shot out the back end of the gun which was unlike the videos I saw. To put it together, the order appears to be spring (part 700), then part 800, hollow sleeve (no part #) then the cap (part 2000). In order to screw it together you have to put pressure on it to compress the spring then run the screw into the end cap.* No hammer pin. I swear I never saw it and thought maybe I had lost it...but it doesn't appear to have one.Now after all this the gun still leaks, but it leaks a lot slower after using a replacement breech seal (part 1500). At least I can put it together though.