Left 4 Dead

The Weapons seen in-Game

Springfield Armory 1911-A1

A Springfield 1911A1 is the primary handgun of all the players, if a second one is obtained, they can be dual wielded, but the second one does not have a flashlight. Oddly enough, the weapon has a 15-round magazine, but they never run out of total ammunition. They are Zoey's primary weapon in the intro film and the trailers.

Remington 31

Seen many a time by Francis, this shotgun is Francis's main weapon in the intro and trailers, but also houses a flashlight, as all of the other weapons do. It retains all of the features of a Remington, but having a magazine cap similar to an Ithaca 37, as the Remington 31 was the basis for the Ithaca 37.

Uzi

A Full-sized uzi with a 50-round magazine and a flashlight taped to the hand guard is the other First Tier weapon. It is Louis' main weapon in the Intro film, in game, and in the trailers, Zoey and Bill also use it in game.

M16A3

The M16A3 with a 50-round magazine and a flashlight clipped to the barrel is a Second Tier weapon. It is called the M16A2 in game, but its full autofire capability identifies it as an A3. It is Bill's main weapon in the Intro film and the trailers.

Upon close inspection in the game it seems that it would seem to be some kind of custom M16 variant. If you look closely you can see that the handguards are that of the M16A1 as is the non-removable carrying handle,(no knobs or rail)and the full-auto firing selector as you previously stated while retaining the A2's foregrip. However, this is probably just the result of lack of attention to detail by the designers.

                          -Atlas

The A3 doesn't have a removable carrying handle, it fits all of the characteristics of the A3, with the exception of 'M16A2' on the side.

Benelli M4 Super 90

Another Second Tier weapon, the Benelli M4 in-game has a 10-round magazine and a flashlight clipped to the barrel right in front of the handguard, Francis will use one whenever he finds it.

Ruger Mini-14

A Ruger Mini-14 is one of the most realistic weapons in the game, it has a scope, 15-round magazine and a flashlight; Zoey uses it in game.

M134 Minigun

An M134 Minigun seen mounted on a monopod in the game, usually at the end of the campaign, set up behind sandbags.

Molotov Cocktails

Exactly what the name says it is, it sets a small portion of the floor on fire for a few seconds, anything that wanders too close will be lit on fire.

Pipe Bombs

A Pipe bomb is the games equivalent of a grenade. It has a fuse, but cannot be cooked for some odd reason. It is incredibly effective against basic zombies, which are attracted to it. Tanks however, the one thing that you might need to use it against, runs away from it, and the long fuse doesn't help.