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Message: <blockquote data-quote="RandyDSok" data-source="post: 176031" data-attributes="member: 201">I'd have thought that would have been obvious Rob since we've been talking air guns.... Nitrogen. The problem here is that different gasses will have different compression levels that they can reach. I have no idea what pressure the 12g CO2 cartridge the typical air pistol uses has. If you switch to another type of gas, you aren't going to want to over pressurize it beyond what the air gun is rated to hold... or under pressurize it and not get the performance you want to see out of it. After finding out what the pressure requirements are meant to be... then capacity would be the next concern. In other words, how many viable shots you can get out of it at that pressure level. The quick search and watching of a single video about refilling the CO2 cartridges certainly didn't answer any of the safety questions I just mentioned ( pressure or capacity really ) and they only guessed they were getting about 1/3 to 1/2 of the number of shots... They didn't even mention if they got good groups or not using it. This is why when I last posted about this stuff, that whom ever is looking to do this type of thing ( refilling their own tanks or carts ) that they need to do some additional research. It's also why I mentioned the PCP type air gun/pistols because I knew they were made for refiling so those types of ratings etc should already be well known in that community with a little bit of searching. Don't take a bit of general info by a bunch of yahoo's ( that'd be us since we know only a little bit ) you find on the internet as enough knowledge... do your research, it doesn't take that much extra time or work to do things safely. There are a worlds of difference between getting an idea of how something works, gaining knowledge of that concept.... and putting it into use and gaining  experience with it. At some point after getting a lot of experience, you may even find a little wisdom there somewhere. Or that is the hope...</blockquote>

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