AN-M4 (37 mm)

Description

The 37 mm AN-M4 is an American naval autocannon. It is the naval version of the 37 mm M4 cannon found on the P-39 Airacobra, and the P-63A-5 Kingcobra.

Vehicles equipped with this weapon

• PT-314
• PT-565
• Thunderbolt (PT-556)
• PT-200
• PT-658

General info

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Available ammunition

Penetration statistics
Ammunition	Type of warhead	Penetration @ 0° Angle of Attack (mm)
		10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
M54 shell	HEFI-T*	3	3	3	3	3	3
M80	API-T	41	39	33	26	21	17

Shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Explosive mass (TNT equivalent) (g)	Ricochet
							0%	50%	100%
M54 shell	HEFI-T*	610	0.61	0	0.1	65.25	79°	80°	81°
M80	API-T	556	0.75	-	-	-	47°	60°	65°

Comparison with analogues

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Usage in battles

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Pros and cons

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History

A hydraulically recoil operated design created by legendary gunsmith John Moses Browning, the 37 mm gun M4 was first developed for use on aircraft such the P-39 Aircobra and the P-63 Kingcobra. Needing a "barge-buster" weapon for their PT boats, the M4, known as the AN/M4 in naval service, was salvaged from P-39s at Henderson Field on the island of Guadalcanal and mounted on the boats for the Solomon Islands Campaign in 1942. After the success of the M4 in the naval role, the Navy started to standardize these improvised guns, eventually mounting the M9 37 mm gun on PT boats in 1944 which used a more powerful round.

Media

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See also

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• reference to the article about the variant of the cannon/machine gun;
• references to approximate analogues by other nations and research trees.

External links

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