Nice setup! Thanks for sharing.
The Model 610 was classified as the XM177 but adopted by the Air Force as the GAU-5/A Submachine Gun (GAU = Gun, Aircraft, Unit.) The Army purchased 2,815 Model 609 CAR-15 Commandos on June 28, 1966, which were officially designated Submachine Gun, 5.56 mm, XM177E1. - Wikipedia