Your arsenal consists of a linear selection, and very little gimmicks; basically a mod where you only need to know Mouse1 and Mouse2. You shoot stuff down, and that's more than enough.
Knife - Slot 1
Your trusty knife. It's already strong enough to take down hitscanners in one or two hits. Can be enhanced with berserk.
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Chainsaw - Slot 1
Your old friend, drowned in blood from so many battles. Not enhanced by Berserk, but fast enough to tear down many monsters.
If by any chance you think it is too powerful with infinite ammo, go to the options menu and enable it to use fuel!
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Revolver - Slot 2
Your sidearm. And when i say "sidearm", i'm not joking; This revolver will prove useful for you in many situations. If you by any chance are wielding the shotgun, super shotgun, battle rifle or grenade launcher, press Altfire to discharge your revolver on monsters and maybe save your life before reloading.
Tip: Your revolver is ALWAYS 100% accurate on the first shot!
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Shotgun - Slot 3
The workhorse of the mod. Fire, pump, fire again. Six buckshots of pure joy.
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Super Shotgun - Slot 3
Here, the Super Shotgun uses a different ammo as a way to, both use the normal shotgun and save ammo for stronger monsters.
BUT, if you don't like it, and want it to use normal ammo, you can go to the options and change its ammo type on the fly!
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Battle Rifle - Slot 4
Your starter weapon along with the revolver. No need to wait until you get a chaingun. 30 shots before reloading.
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Grenade Launcher - Slot 5
The Blooper will get you places if you learn how to master its arch and fire it properly.
To compensate for the single shot before reloading, your firepower is stronger than usual.
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Minigun - Slot 4
A faster alternative for the chaingun, albeit with way less accuracy.
Use it only if you feel confident that your shots are going to make minced meat out of monsters.
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Incinerator - Slot 6
This gun is a short-ranged flamethrower, but strong enough to melt the monsters you see around.
Useful if you think the last weapon consumes too much ammo, or if you don't have anything powerful yet.
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Calamity Blade - Slot 7
The last UAC creation before migrating to the now almost extinct plasma weaponry.
Charges and fires a big horizontal wave able to burn and obliterate monsters on its path.
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Secret Weapons:
You also have a few secret toys to play with.
If you're eager to obtain them, get 100 kills with the knife, 200 kills with the shotgun, and 300 kills (!) with the Grenade Launcher.
You won't be disappointed.