Capwn's Advanced Weaponry Mod:
Weapon Spawns:
-AR replaces frag nades.
-Plasma rifle replaces sniper.
-Plasma pistol replaces base pistol and AR.
-Pistol replaces shotgun.
-Shotgun replaces plasma rifle.
-Sniper replaces ridge/cave pistols.
-Rocket launcher and fuel rod are switched.
-Starting weapons (both slayer and CTF) are the plasma pistol and the AR.
Vehicles:
-Hog:
-Driver can shoot.
-3rd person passenger.
-Fires bursts of needles.
-Rocket hog:
-Same as normal hog.
-Fires fuel rods.
-Banshee:
-Primary fire shoots nerfed turret rounds.
-Secondary fire shoots anti-vehicle rounds.
-The ghosts and tanks are unmodded.
Weapons
-Plasma pistol (primary): Fires "taser" rounds. These do no damage, but instantly kill shields as well as stun and cause shake.
-Plasma pistol (secondary): Drops active camo.
-Plasma pistol (melee): Insantly kills.
I have named it the "ninja gun."
-AR: Shoots nerfed shotgun blasts.
-Plasma rifle: Shoots "seekers," which are like needles on steroids.
-Pistol: Is now a glock. shoots 15 rps and fires nerfed AR rounds.
-Sniper: Uses AR contrails, does 1/4 less damage, fires at 3 rps, shots have slight stun, double damage against active camo, more effective vs. vehicles.
-Shotgun: Deals very little damage, but it's shots have high(ish) force.
-Flamethrower: Fires nerfed pistol rounds. Ammo recharges over time.
-Rocket launcher: Shoots tank shells.
Fuel rod: Anti-vehicle gun. Fires plasma nades.
Misc:
-Active camo lasts for 60 seconds and respawns every 60 seconds.
-Falling will kill your shields, but it won't hurt you.
Here's the download link: http://www.mediafire.com/download.php?1ryjnzqzziz
Have fun!
(btw, I'm setting up a game now. come join if you'd like)
I just got out of a game of this. I further modded the plasma pistol's melee to have a force of 20, just for effect. Now whenever I punch people, they go flying 
But yeah, there aren't a ton of big changes in this version.