M4 autocannon
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The 37 mm Automatic Gun, M4, known as the T9 during development, was a 37 mm recoil-operated autocannon designed by Browning Arms Company and entered service in 1942. The M4 and its variants would pri
An M4 gun displayed at the Finnish Air Force Museum, 2012
P-39Q Airacobra weapons bay showing the M4 cannon's "horse-collar" drum magazine
Restored PT658 on the Columbia River, October 2014. Note: M4 37 mm (1.46 in) automatic cannon mounted on the bow.
M4 at the National Museum of the United States Air Force
Bell P-63 Kingcobra
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The Bell P-63 Kingcobra is an American fighter aircraft that was developed by Bell Aircraft during World War II. Based on the preceding Bell P-39 Airacobra, the P-63's design incorporated suggestions
M4 autocannon
…under-contract by Colt) and is therefore sometimes referred to as the "Colt M4" or "Oldsmobile M4." It was primarily mounted in the Bell P-39 Airacobra and P-63 Kingcobra, with the US Navy also using it on many PT boats. Designed primarily as an anti-aircraft weapon, the gun had a muzzle velocity of 2,000 ft/s (610 m/s…
Bell P 63A Kingcobra 42 68871
Bell assembly line near Niagara Falls, New York
First production P-59A with a P-63 behind.
L-39 with swept wings, extended rear fuselage, ventral tail fin and P-39 prop