This is a bit dated http://www.network54.com/Forum/275684/thread/1132852914
scroll down near the bottom of the page, think I got near 30fpe on carts higher on bulk co2 then took it to 1500 psi HPA after securing the valve good but don't remember the numbers. A kick in the pants to shoot they are but spendy pellets and only a few shots per cart or fill. Loopy trajectory but good for 30-35 yards the gun was stolen by the druggies though so never really got finished.
The more recent 9mm carbine/arrowgun combo was the 70-100+ fpe gun. http://www.network54.com/Forum/275684/thread/1451974649
Really light gun with the infamous Cothran valve which is better than anything I have built thus far. Others have done the 9mm and 30 cal. as well.
I used to have a life. But now I have the forum. I am a sick man?