I have a Garmin GPS50 in excellent shape that I would like to trade for a flat top upper receiver. I already have the barrel assembly and a .22 kit and all I need is the receiver. If you have a receiver but don't need the GPS, let me know and perhaps I have something else you would be interested in.
In fact, if you have a complete upper I also may be interested in trading for that too. I have lots of stuff to trade.