how do i change bullet types?

hey recently i got KCGEOGES pack and they shoot errors i know why and i just dont have the money at the time to buy css or day of defeat and im not a pirate so im not gonna rip the source files from online i know how to code a little but i was wondering where and what do i type to change them.

You could probably edit the lua files of the weapons if you can be bothered.
The weapons lua file should be located in garrysmod\addons<addonname>\lua\weapons<weaponname>
Here’s a weapon from WAC as an example.

SWEP.Base = "w_wac_base"

if SERVER then
	AddCSLuaFile ("shared.lua")	

SWEP.Spawnable			= true
SWEP.AdminSpawnable		= true

SWEP.PrintName			= "AK47"

SWEP.AimAng				= Angle(-2.94, 0, 0)
SWEP.AimPos				= Vector(6.08, -5, 1.85)

SWEP.Slot					= 2
SWEP.IconLetter			= "z"

SWEP.ViewModel			= "models/weapons/v_rif_ak47.mdl"
SWEP.WorldModel			= "models/weapons/w_rif_ak47.mdl"
SWEP.ViewModelFlip		= true

SWEP.Primary.Sound		= Sound ("Weapon_AK47.Single")
SWEP.Primary.Damage		= 12
SWEP.Primary.NumShots	= 1
SWEP.Primary.Cone			= 0.01
SWEP.Primary.Delay		= 0.13
SWEP.Primary.Recoil		= 0.2

SWEP.Primary.ClipSize		= 30
SWEP.Primary.DefaultClip	= 30
SWEP.Primary.Automatic	= true
SWEP.Primary.Ammo		= "smg1"

SWEP.BackPushY			= -0.5
SWEP.BackPushZ			= 0.1

SWEP.Secondary.ClipSize	= -1
SWEP.Secondary.DefaultClip	= -1
SWEP.Secondary.Automatic	= false
SWEP.Secondary.Ammo		= "none"

The lines you want to edit are

SWEP.ViewModel			= "models/weapons/v_rif_ak47.mdl"
SWEP.WorldModel			= "models/weapons/w_rif_ak47.mdl"

Good luck.
Or you could just buy css to avoid further complications (almost all servers use some sort of CSS content)

[editline]24th June 2011[/editline]

However, if the gun are SHOOTING missing models, you should take a look at the code of the gun and look at what model that is. (and I have no idea what gun it is and why it’s firing props)

(Neither do I have any coding experience)