1. Open up the Weapon_Gun.zip
2. Open up the server.cs in Notepad or a similar text-reading program
3. Check this part out:
AddDamageType("Gun", '<bitmap:add-ons/Weapon_Gun/CI_gun> %1', '%2 <bitmap:add-ons/Weapon_Gun/CI_gun> %1',0.2,1);
datablock ProjectileData(gunProjectile)
{
projectileShapeName = "./bullet.dts";
directDamage = 30;
directDamageType = $DamageType::Gun;
radiusDamageType = $DamageType::Gun;
Play around with the damage.