12 oz c02.
regular grav feed.
Every thing: shoots straight, fast etc.
I liked it i used it at my field shot straight and amazing. I said it looked ugly then i tryed it. then i said insulting my self... takes one to know one. It was light and also the gas effiency was alright.
I think it weird that the barrel port is so far back but thats personal preferance
to be honest i never knew about alien untill i saw this.