Sooooo - DSA SA-58 18" carbine, correct? Looks nice. I see you got the Type 2 upper receiver, which is probably the best kind (matter of opinion). Enjoy! Set the gas regulatory fairly closed (more gas on action) to start with, like position 2, since you may get the empty case reinserted into the chamber and a bit of a jam if you set the regulator too open. (Ask me how I know this.)