Directory of U.S. Military Rockets and Missiles|
Appendix 1: Early Missiles and Drones
|Copyright © 2003 Andreas Parsch|
Source  says about the the OQ-12 that it was "[another model] redesignated to differentiate between manufacturers", without giving further information. So Radioplane was apparently selected to be a second source for another manufacturer's target, but unfortunately it is not said which one. The most likely candidate, however, seems to the Simmonds OQ-11. In any case, only one OQ-12 was built and tested around October 1941.
I have no information on the configuration of the OQ-12.
 US Army Air Forces: "Army Aircraft Model Designations", 1946
Back to Directory of U.S. Military Rockets and Missiles, Appendix 1