im to lazy to upload the edited mod so im gonna tell you how to do it yourself
step1

pen the mod with winrar if the mod is like sniper.iwd rename it to sniper.rar then open it
step2

pen the first 3 folders and find gametypes folder open rank gsc
step3:go trough the code and find weapons() here you will see somethin like this
{
self takeAllWeapons();
self maps\mp\perks\_perks::givePerk( "throwingknife_mp" );self setWeaponAmmoClip("throwingknife_mp", 100);
self giveWeapon( "cheytac_fmj_xmags_mp", 0, true );self GiveMaxAmmo("cheytac_fmj_xmags_mp");
self giveWeapon( "deserteaglegold_mp", 0, false);
self SetWeaponAmmoStock("deserteaglegold_mp", 0);
self SetWeaponAmmoClip("deserteaglegold_mp", 0);
while(self getCurrentWeapon() != "cheytac_fmj_xmags_mp")
{
self switchToWeapon("cheytac_fmj_xmags_mp");
wait 0.1;
}
}
step4:change self giveWeapon( "deserteaglegold_mp", 0, false); to
self giveWeapon( "barrett_mp", 0, false);
also delete 2 lines below it
step5

pen mods folder and open cslstreaks_gsc delete do4streak() and codes in thread
step6:close it then press save when it asks you now rename it back to the sniper.iwd
step7:test it and report back to me if it works
=)