No need for 'alien' weapons

Lenin's model was greatly improved from the very beginning.

Most of the improvement was due to the game mechanics, which made the albino Komodo dragon a fearsome warrior (both as a player character and as a boss).

As with Albert Lester from Resident Evil: Outbreak, the villain doesn't need and sort of 'alien' weapons to terrorize the victims. Instead, a basic bladed weapon (such as the iconic Drachenschwert) is more than enough to one-hit kill most victims, often because of the Weapon Break maneuvers; furthermore, the giant lizard can wield a battle axe in 3D games (just as intended to do).

Another inspiration came from the Gamorrean Guards (NPCs from Star Wars: Battlefront II), since they can easily on-hit kill their victims at close range. They attack by repeatedly swinging their axes, which can kill their victims (players included) in one or two hits. 

As for the firearms, Lenin uses the assault cannon in shooting segments (when the enemies attack his lair), being able to one-shot most of his victims (because of the game mechanics).

The so-called Smart Dragon assault cannon (above) is in fact a Big Fucking Gun, a big weapon with a pornographic firepower.

Lizardmageddon: Brazil will have a New Game Plus, and unlimited ammunition (no reloads) is one of the unlockables.