Ack-Ack-Ackshually those were Colt Monitor's firing the .30-06s: a licensed derivative copy of the BAR meant to be a semi-concealable "fighting rifle" for law enforcement. This was achieved by cutting down the stock and barrel so you could carry it shoulder-slung and even tuck it under a coat and swing it up for immediate action.I've seen that car in person, it's at the Whiskey Pete casino in Primm, Nevada. It also got hit with a bunch of .30-06s from a few BARs.
Problem was, that made the thing too light to handle the kick of fullsize rifle cartridges in full-auto with anything close to accuracy, and it was quickly retired as the FBI/Police decided pistol-caliber SMGs or semiauto carbines were a more sensible option.
The fact it managed to hit the broadside of a stopped car at all was probably the weapon's greatest achievement.
Thank you to Ian McCollum at Forgotten Weapons for educating me on this matter so I could enlighten you all with my massive gun autism...
Also, Clyde made a habit of stealing Ford V8's whenever he could, as that was the only common production car in the US at the time with such a large motor, allowing him to run from lesser-equipped police departments with ease. He even wrote Henry Ford in 1934, praising the getaway-car ability of the Ford V8 in one of the oddest product testimonials in history:
" the Ford has got ever other car skinned and even if my business hasen't been strickly legal it don't hurt enything to tell you what a fine car you got in the V8 "