I'm not sure if you got my last but the barrel is extruded with rail built in. I got gun end of summer at tournament. I compared to Rob Allen and the Pelaj seems beefier. Has extra handle grip and the three extra Pelaj power bands. I think the shaft is 7.5mm looking at it. I'm trying to get three guns that all use the same shaft as my wife's Wong or Iwouls give it a try for the $200. It had a ridiculous price tag of $5oo plus on it when I got it.