I am interested in making my sp1 look like an m4. I saw tha amazon has a m4 carbine system for the sp1. Does anyone know if this is a good system? I wanted to get a ceramic j and j barrel, but I don't know if they make an attachment that can go on it, like this: http://www.armedpaintball.com/paintb...=0CHA QgwgwAw
? Is there any other m4 styled barrel systems that cost less than the one on amazon?