Yup it's Carbon. And yes I've also played it online. There are two things you can do to get the parts, one is use a save editor(not a hack or cheat believe it or not) or you can just beat the campaign yourself. I've done both so it's whatever you want to do. :P And I dunno bout any hacks yet.... I have a couple nice pistols though.
This is the game url: embed src="http://novelconcepts.co.uk/FlashElementTD/FlashElementTD.swf" menu="false" quality="high" bgcolor="#333333" width="650" height="450" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /
Put that in your profile. Don't forget the < at the begin and the > ad the end. I have the 3ds max files on my pc but i gotta upload them but I don't have the time for it now. I'll do it in a week.