(A.N. Correct me if I'm wrong on something.)
Weapons of the Imperium of Man:
Flamer:
Uses promethium
If you survive the flames, you'll die to the toxic cloud
Hand Flamer:
Same as above
Heavy Flamer:
Used by space marines
Better than Flamer in everyway
Incinerator:
Same as heavy flamer
Fuel is blessed and does more damage to demons
Lasgun:
Can blow off limbs
"PEW"
Never jams
The power unit can be recharged with a firecamp
Laspistol:
Portable Lasgun
Lascannon:
Shoots out Lazer beams
Anti-armor Lazer beam
Can be held by space marines
Must be wheeled by Astra Milatarum
Hellgun:
Lasgun but stronger
Expensive
Only used by high-ranking Astra Militarum
Hellpistol:
Same as Hellgun
Meltagun:
Shoots out a torrent of intense heat
Useful against armor
Multi-Metla:
Space marines
Two barrels
Inferno Pistol:
As good as meltagun
Portable
Plasma Gun:
Mini sun
Kills user when it overheats
Super-heated balls of death
Minimized risk of death
Plasma Pistol:
Astartes general side-arm of choice
Gravgun:
Can be lethal or not
Increases or decreases the mass of an object
Grav-pistol:
Same
Combi-grav:
Bolta + Gravgun
Missile Launcher:
Yes
Assault Cannon:
Self-loading
Used by terminators?
Auto-cannon:
Bolter
Mounted LMG
Auto-gun:
Any balistic weapon
Explosive rounds
Auto pistol:
Handgun
Bolter:
Space marines and sisters of battle
Rips through people with ease
The rounds blow up
Bolter Pistol:
Yes
Heavy Bolter:
Stronger
The force of a bullet flying past you would crush your bones and organs
Exodus Pistol:
Vindicare Assassins
Glock? One bullet?
Exodus Rifle:
Die when shot
Different ammunition types
Reaper Auto-cannon:
Less powerful than auto-cannon
Ripper Gun:
Fully auto shotgun
Used by Ogrins
Needler:
Shoots Lazer than cuts through armor
Then shoots poison dark
Conversion Beamer:
Pure energy that makes energy
Nueral Shredder:
Targets neural system
Webber Gun:
Non-lethal
Used for crowd control or arrests
(A.N. Notes for other races will come later.)