The Grenade Launcher is a recurring weapon in the Tomb Raider series.
Original Timeline
Tomb Raider II
TR2
TR3 Grenade Launcher
The Gernade Launcher was the most powerful weapon in the game. One shot was usually enough to kill any enemy, with the exception of the Xian warriors. Shots would just go straight and explode when making contact with anything
Tomb Raider III
The Grenades bounce off walls and explode after some time, while in TR2 they . Each ammo pack for it has two grenades and is anything but very scarce, so is best to be conserved.
Tomb Raider: The Last Revelation
TR4
In TR4 it can utilize three types of ammunition
Normal ammo: Large shells filled with plastic explosives. Explodes upon impact with a target, doing heavy damage. Often, the most common out of the three types.
Super ammo: Exactly like normal ammo but filled with more explosives. The most rare out of the three grenade types, but also the most powerful, often killing a normal enemy with one shot and doing extreme damage to bosses.
Flash ammo: When it hits the ground, it emits a glaring flash and a loud noise that blinds most enemies upon impact; However Lara won't be affected by it. The weakest out of the three grenade types, but can be very useful in a getaway situation.
Firepower: 10/10
Firing Rate: Must be reloaded after each shot, and slower than the shotgun.
Legend Timeline
Tomb Raider Legend
Lara can take a grenade Launcher from "Heavy Mercenaries" in the later levels of the game. It can carry a total of fifteen grenades.
Lara Croft and the Guardian of Light
Lara Croft and the Temple of Osiris
Survivor Timeline
Tomb Raider
Lara acquires a grenade launcher in the Solarii fortress. She attaches it to her assault rifle. It is able to kill several enemies, and destroy cover, It can be upgraded to fire Frag Grenades which offer more damage.
It has the added function of destroying metal barriers.
Multiplayer
The multiplayer features a grenade launcher, with choice of ammo between, Frag Grenades, Incendiary, Grenades, Smoke Grenades and Flash grenades.
Rise of the Tomb Raider
Grenade Launcher Ammo
Grenade launcher is an attachments for the Assault Rifle that can be acquired from the vendor for 120 Byzantine Coins. Lara learns how to craft the ammunition for it using natural resources, as well as upgrading the heads to fire Cluster cluster bombs.