1. Config for Projectile.god

@Projectile "riot_grenade" {
   physics=1
   filename="models/weapons/riot_grenade.chr"
   bbox_min_x=-2
   bbox_min_y=-2
   bbox_min_z=-2
   bbox_max_x=2
   bbox_max_y=2
   bbox_max_z=2
   gravity=0.45
   bounciness=0
   lighting_level=0
   projectile_impact_damage=0
   projectile_impact_stamina=0
   add_effect="WhiteSmokeTrailEffect"
   sound_create="grenade_fly"
   impact_damage_type="pierce"
   expire_explosion="HawGrenadeExplosion"
   autoface=1
   hit_points=5
}

2. Config for weapons.god

@Weapon "RiotGun"
{
   filename="models/weapons/riotgun.chr"
   lighting_level=3
   track_to_joint="Bip01 R Gunjoint"
   track_joint="Handle"
   exclusive_modes=0
   holster_sound="Holster"
   unholster_sound="Unholster"
   @Mode "Primary"
   {
      weapon_reload_sound="Riotgun_Reload_Sound"
      ammo_count=50
      weapon_type="instant"
      fire_period=.1
      weapon_ammo_index=6
      weapon_ray_length=4096
      weapon_ray_spread=0.035
      weapon_ray_damage=18//was 15
      weapon_ray_number=1
      weapon_fire_sound="MGunFire1"
      weapon_fire_empty_sound="GrenadeBlank"
      weapon_reload_time=1.9
      collision_effect="Pistol_Puff"
      muzzle_effect="Riot_MuzzleFlash"

      weapon_ray_stamina=8
      add_discharge_effect="SpentPistolEffect,clip2"
      damage_type="pierce"
      ai_min_range=128
      ai_max_range=1000
      ai_burst_time=1
   }
   @Mode "Secondary"
   {
      weapon_type="projectile"
      fire_period=.85
      weapon_ammo_index=9//new gas grenade index
      weapon_projectile="riot_grenade"
      weapon_projectile_velocity=800
      weapon_fire_sound="GrenadeFire"
      weapon_fire_empty_sound="GrenadeBlank"
      muzzle_effect="MuzzleSmokePuffLauncher"
      launch_joint="pump"
      ai_min_range=192
      ai_max_range=500
   }
   encumbrance=0.15

   // Weapon as pickup settings.
   add_damage_type_adj="gas,0"
   add_damage_effect="energy|buckshot|pierce,ExplodingSparksEffect"
   pickup_spin=1
   pickup_bob=1
   give_weapon="RiotGun"
   give_ammo_type=6
   give_ammo_count=25
   give_ammo_type2=9
   give_ammo_count2=2
   sound_pickup="WeaponPickup"
   hit_points=20
   expire_explosion="RiotgunExplosion"
}