M31 HEAT rifle grenade

M31 HEATM31 rifle grenades
The M31 HEAT is a fin-stabilized anti-tank rifle grenade designed in the late 1950s to replace the Belgian ENERGA rifle grenade which was adopted by the US Army and US Marines as an emergency stop-gap measure during the Korean War.wikipedia
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Rifle grenade

grenade musketrifle grenadesrifle-grenade
The M31 HEAT is a fin-stabilized anti-tank rifle grenade designed in the late 1950s to replace the Belgian ENERGA rifle grenade which was adopted by the US Army and US Marines as an emergency stop-gap measure during the Korean War.
The M31 HEAT rifle grenade is a fin-stabilized anti-tank rifle grenade designed in the late 1950s to replace the Belgian ENERGA rifle grenade which was adopted by the US Army and US Marines as an emergency stop-gap measure during the Korean War.

ENERGA anti-tank rifle grenade

EnergaENERGA rifle grenadeAnti-Tank Grenade No 94 Energra
The M31 HEAT is a fin-stabilized anti-tank rifle grenade designed in the late 1950s to replace the Belgian ENERGA rifle grenade which was adopted by the US Army and US Marines as an emergency stop-gap measure during the Korean War.
The M28 was eventually replaced in US military service by the M31 HEAT rifle grenade and later by the M72 LAW rocket.

M72 LAW

LAWLAW rocketM72
The warhead technology developed for the M31 was used for the future M72 LAW antitank rocket. Various US military manuals issued in 1972 still had sections on the M31, but by the end of the Vietnam War, both the US Army and US Marines had essentially phased out muzzle-launched rifle grenades, in favor of the M72 LAW disposable rocket in the anti-armor role and the M203 under-barrel grenade launcher in the squad fire-support role.
In early 1963, the M72 LAW was adopted by the U.S. Army and U.S. Marine Corps as their primary individual infantry anti-tank weapon, replacing the M31 HEAT rifle grenade and the M20A1 "Super Bazooka" in the U.S. Army.

High-explosive anti-tank warhead

HEAThigh explosive anti-tankhigh-explosive anti-tank
Like the ENERGA, it has a nose-initiated, based-detonated HEAT warhead, but unlike the ENERGA, the mechanical impact fuse system is replaced with a less complex and more reliable piezo-electric fuse system which also allows higher angles of impact, up to 65 degrees.

Piezoelectricity

piezoelectricpiezoelectric effectpiezo-electric
Like the ENERGA, it has a nose-initiated, based-detonated HEAT warhead, but unlike the ENERGA, the mechanical impact fuse system is replaced with a less complex and more reliable piezo-electric fuse system which also allows higher angles of impact, up to 65 degrees.

M1 Garand

M1 Garand rifleM1 rifleM-1 rifle
The M31 was originally designed to be fired only from the M1 Garand, but could also be fired from both the M14 and M16 rifles.

M14 rifle

M14M-14M14A1
The M31 was originally designed to be fired only from the M1 Garand, but could also be fired from both the M14 and M16 rifles.

M16 rifle

M16M-16M16A1
The M31 was originally designed to be fired only from the M1 Garand, but could also be fired from both the M14 and M16 rifles.

M203 grenade launcher

M203grenade launchersColt M203
Various US military manuals issued in 1972 still had sections on the M31, but by the end of the Vietnam War, both the US Army and US Marines had essentially phased out muzzle-launched rifle grenades, in favor of the M72 LAW disposable rocket in the anti-armor role and the M203 under-barrel grenade launcher in the squad fire-support role.

M9 rifle grenade

M9M9 High-Explosive Anti-Tank (HEAT) rifle grenaderifle grenades
It was replaced in the anti-tank role by the M28, an American version of the Energa rifle grenade, which was itself replaced several years later by the M31 HEAT rifle grenade.