It finally arrived today. To answer some previous question, it does indeed say wintec on the bottom of the trigger guard. The frame is also numbered 1168 (if I remember right - I'm posting from work). It is indeed a unibody. Has 2 brass thumbscrews about 120 degrees from the frame on each side towards the rear of the body. The bolt is kind of unusual. It has a brass threaded tube that accepts an allen key to adjust mainspring preload (for velocity) and a delrin part that screws onto the barrel-end of the bolt. Somewhat, but not exactly similar to the bolt here
. I'll get photos as soon as I can.
It does shoot pretty nice.