I built a butane powered spit wad gun. It shoots airsoft bbs too but that is just crazy. It shoots amazingly fast.
If anyone has an idea how to make tracer rounds for it just say 
 
http://www.youtube.com/watch?v=2G0I3fOktck
                
                
                    If anyone has an idea how to make tracer rounds for it just say
 
 http://www.youtube.com/watch?v=2G0I3fOktck
"DON'T TASE ME BRO!" lol
                
             

 
 

![http://www.airsoftatlanta.com/images/glow_dark_bottle_jpg.jpg [http://www.airsoftatlanta.com/images/glow_dark_bottle_jpg.jpg]](http://www.airsoftatlanta.com/images/glow_dark_bottle_jpg.jpg)