Shotgun

The shotgun is a frequently occurring weapon in the Tomb Raider series. It has appeared in every Tomb Raider main game up to date.

Tomb Raider-Tomb Raider Chronicles.
The shotgun appears in all games, it offers, Massive damage, but short range. It does not need to be reloaded in real time but offers massive fire power.

Tomb Raider Angel of Darkness
The shotgun is replaced by the V-Packer. The in-game description describes it as a 6 shot and slow reload weapon, having either standard or wide shot shells, but in the main game screen, it has a 25 round tube magazine, does not need to reload, has a semi-automatic fire, does not come with wide shot shells, and ammo is very common. However, it will become useless after Galleries Under Siege, since Lara will be stripped of all of her weapons by Kurtis. The shotgun fires 6 pellets per shot with random spread applied. Each pellet deals 3 damage, for a maximum of 18 damage per shot.

Legend Timeline
Tomb Raider Legend

Lara can pick up shot guns from fallen enemies. It offers massive damage and spread, but does have limited ammo, and is rare to pick up.

Tomb Raider Anniversary

The Shot gun returns, it has an 8 round tubular magazine, and a max ammo capacity of 40. It can be found in the Lost Valley, if not found there, it will be taken from Larson Conway, who it will be reacquired form, in Natla's mines.

Tomb Raider Underworld

Lara has access to the Tactical Shotgun in her inventory. No ammo can be picked up.

Lara Croft and the Guardian of Light

Lara Croft and the Temple of Osiris

Tomb Raider
Lara acquires a trench gun, in a chasm along the monastery. It can be upgraded to a Pump-Action Shotgun, and the tactical shotgun, when sufficient Shotgun parts are found. Each new Shotgun offers additional, upgrades. The Shotgun has the added funtion of destroying wooden barriers.

Trivia

 * The shotgun, as it appeared in Tomb Raider and Tomb Raider II, featured in earlier versions of Tomb Raider III (such as the demo of it that came with Pandemonium) until its appearance was changed to what is in Tomb Raider III now.
 * In an earlier version of Tomb Raider: The Last Revelation, the shotgun in the inventory looks different to how it does in gameplay. In gameplay, it looks like the Tomb Raider III shotgun. The inventory one also appears to have a Flashlight on it. Perhaps Lara was to have used the shotgun as a light source as well as a weapon.