The 40mm Grenade is a Fragmentation or High Explosive weapon designed to be launched from a purpose-built grenade launcher, or an underslung attachment.
It inflicts damage similar to a Hand Grenade, but is launched faster and further than a hand grenade can be thrown. It can be fatal to infantry, causes serious damage to light vehicles, but inflicts only minor damage to heavier armor.
In all games where it appears, 40mm grenade launchers are assigned to the Assault kit.
Battlefield: Bad Company 2
— In-game description
In Battlefield: Bad Company 2, 40mm grenades are used on the following launchers:
- GP30 - mounted on the AEK-971 Vintovka and AN-94 Abakan.
- M203 - mounted on the STG.77 AUG, M416 and M16A2.
- XM320 - mounted on the XM8 Prototype.
- GL1 - mounted on the F2000 Assault.
Frag grenades are initially available to each faction, with other 40mm ammunition unlockable through kill progression.
40mm grenades return to Battlefield 3 as the initial ammunition for the M320/GP30 grenade launcher. It inflicts splash damage comparable to other explosive weapons (e.g. M67 Frag, SMAW/RPG-7V2), which can be reduced to non-fatal levels by the FLAK specialization. Equipping the FRAG specialization provides more reserve ammunition for this weapon, as well as an extra hand grenade.
Other versions of 40mm ammunition can be unlocked for the grenade launcher, which are reported in the killfeed as entirely separate weapons. Regardless of ammunition or launcher type, all statistics are combined into a single listing for the M320.
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— Battlelog description
40mm HE is the standard ammunition for the M320 and GP-30. It can kill an enemy in one hit from its blast damage, but its effective radius is small, meaning it must land close to the enemy to kill him.
Also, it can be very effective against light vehicles, and well as helicopters and light naval vessels, doing large amounts of damage to these lightly armored vehicles. As in previous games, it can do considerable damage to buildings.