That bear killing Cub (sounds just wrong doesn't it?) was flown mostly by an old friend of mine.
They mounted the rifle on top of the greenhouse, on a bipod type mount, and installed a sliding trap door in the skylight to facilitate changing magazines. I believe there was a picture or two in the magazine. The rifle was rigged aligned with the plane, but shot over top of the prop.
He said they had an electric gun trigger on the front stick, a homemade sight on the to cowl and the rear seat held a box full of loaded magazines.
The rumor was that till Jim Rearden, the author of the the OL article, got to poking around this deal, they had a BAR (Browning Automatic Rifle) mounted up there, but wound up with an M-1, since there were apparently "ownership issues" with the BAR. Both are 30-06 cal.
He never talked much about this deal, which was done at the behest of the cattle types on Kodiak, and with the knowledge and/or concurrance of F & G. I asked him once how many bears he figured he'd killed, and he reported a significant number verified dead by checking the next day. They'd check carcasses, hoping to catch another bear feeding on that one.
He had been a P-51 pilot in WWII, and spent the latter part of the war in Stalag Luft III. Interesting fellow, but very quiet.
Wouldn't have wanted to have been a bear around him, though.
MTV