The XSB2C-2 was indeed real, it was the fifth SB2C-1 (s/n 00005) and was taken off the production line
to be converted to a floatplane, work was completed Sept. 1942 and USN tests started early in 1943.
Originally 350 were to be procured, but by the time tests were completed the USN was no longer
interested. However, it was the test-mount for the new free-moving twin .30 rear gun-mount that
became standardon the SB2C, replacing the powered twin-.50 mount