I've recently purchased a Glock 17 Gen 4 3.5 mm CO2 pistol and I'm loving it however I'm not loving the 18 shot mag with no options as far as an extended one goes and I've noticed that pretty much across the board with any of the guns that you can only seem to find an extended mag for 6 mm airsoft versions and not the 3.5mm ones, so I was wondering if there was a way to convert it by changing the top piece on the clip to fit BBs instead of airsoft ammunition because I've read that the clip will actually fit from say an 18c 6mm model, it just won't shoot 6 mm out of the 3.5 mm barrel of course, but not sure if anyone's even tried to put BBs in it or shoot them out of one or have luck finding or modding one, but I would definitely be interested in how to do it or if anyone knows of a place to get an extended mag for the Glock gen 4 CO2 BB modelthat would be great but as far as I know they don't make them yet... I've looked into several different options and have done a ton of researching and havent came up with anything as of yet other than possibly buying one and maybe buying a top part from a 3.5 mm and swapping them out. I mean I would think they would load fine it's just they would possibly just fall out of the top or not chamber right or something unless you modified it somehow I'm thinking... Also kind of wondering if there's any kind of conversion kit as far as full auto goes as well for mine and I do have the umarex version by the way I know there's several different manufacturers of these glocks but I forgot to put it in the beginning of the post so I figured I would mention it now LOL. If anyone has any ideas or can help with neither of those questions I would greatly appreciate it and I'm sure this will be a pretty useful topic for people looking for a full auto conversion or extended mag for their non-airsoft versions. Thank you and hopefully I can get somewhere with this now that I joined the forums here...