I have a brand new Rock River Arms M4 post-ban upper for your AR-15. It is an A4 "flattop" upper with a 16 inch barrel and the fake pressed on flash hider (does not actually hide the flash, but looks real). It has the "fat" M4 handguards. The barrel is NOT chrome lined, so a bit more accurate than chrome lined barrels. It has never been fired and handled very little. I am asking $385 shipped and that includes the upper, bolt, carrier and charging handle.
I also have a DPMS removable carry handle for sale. It has the standard A2 rear sight. It has never been used, only handled. Asking $80 shipped or $75 if you buy the upper as well.
I prefer money orders, but will take paypal if you add 3%. firstname.lastname@example.org if you have any questions.
Here is a pic of the M4 upper with the removable carry handle in place.