Hiya. I work at Delta Force, Shoreham (m25 junct4) I've played at Mayhem. Do you go along on the Thurs nites? Maybe you know Marc, Paul & Alan? They have T3's and mags. Sorry to disagree with your post but looks are not just what count. Safety is a big issue too! CO2 bottles are designed to hold co2, Kevlar bottles are designed to hold air. Different pressures, properties (co2 is cold when filled, air is hot), different testing/ratings. If your marker is set up to run on co2 you wont be able to fit a kev bottle on it anway without fitting an air system and changing the cradle/bottom line. If its set up to run on co2 why dont you get an anodised co2 bottle which looks a lot better than the standard black ones, if you're that worried about looks. You could always sell it on next year when you upgrade.