ya look at the front, got a curved wave milling cut back of the front of the body where the barrel goes, 06 speed
also, look at the back of the body, got a pull knob? if ya do its an 05 speed, if ya got a little lever lock, 06 speed.
front of the body where the barrel goes in, is it flush with the ram and lpr tubes? 05 speed
does the back look like a g7 style backplate, or an A4 / A4 Fly backplate? if its an a4 / a4 fly backplate, 05 speed, if its a g7 style backplate, 06 speed.