i knew the fellow with the rifle mounted on the roof of a Super Cub. He flew Mustangs in WW II. The Cub had a sliding hatch in the skylight that permitted in flight magazine changes. He had an electrically activated trigger with switch on the stick. Rumors were that initially the rifle used was a BAR, but when word started getting out about this, the gun was switched to the M-1. I never heard him confirm that.
This “program” was initiated by a few guys running cattle on Kodiak Island, which in itself has proven to be a losing proposition. After these guys had been doing this for a while, Jim Rearden looked into it and wrote some articles about it, including one that appeared in Outdoor Life. Hunters were strongly against the project, and it was soon scrapped after the public learned of it.
MTV