I have several Hitec Electron 6 receivers and they are very nice but the original poster was after a thin receiver that would fit into the wing space of a Gnat. The Electron has the connectors and the crystal protruding at 90 degrees while the Super Slim has them on the edge.

Nobody has yet pointed out that the Hitec Feather you mentioned is a Single Conversion receiver and that in the RF rich environment of combat a dual conversion is a better idea.