Resident Evil Zero

Beretta 92F Mod. Samurai Edge

Rebecca Chambers and the members of S.T.A.R.S. Bravo team carry customized Beretta 92F pistols known as Samurai Edges. During the course of the game, you can find extra parts to customize this weapon with a scope. This upgrade dramatically improves your chance to land critical shots on the enemies.

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"A custom handgun that has been fitted with a scope for greater accuracy. These modifications should make it easier to hit a target's weak point."

Army Hand Gun

Billy Cohen uses this handgun. It's a 9mm, holds 15 rounds and is apparently standard issue for US Army.

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Over and Under Shotgun

Found on the train.

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"A shotgun used for hunting. There's a design carved on the barrel. This model can only be loaded with 2 shells."

Remington 870

Remington 870 Wingmaster. Found in the mansion. In-game the capacity is 7 rounds firing 12 Gauge cartridges.

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Remington 870 12 gauge

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The petite Rebecca Chambers (in bonus costume) carrying the Remington 870

SMG

Unlocked after beating the game. Not sure what this one is. A modified MP5, maybe?

It just resembles an MP-5

It looks like a HK54 with various prop parts added

The weapon is (supposedly) made by (an) Umbrella (subsidiary - in apocryphal literature, the company was called Sporting International), just like the semi-auto Magnum and the Pump Shotgun. This was the game designers' way to avoid copyrights.

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"A small sub-machine. It uses it's own type of ammo magazine."

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Billy (in bonus costume) with the unlockable SMG.