Dominator Custom Rocket Launcher & Shotty skins for Kingpin by Axe
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The zipfile contains two pak files:

pak4 contains a custom rl skin, a custom shotgun skin and green coloured rocket trails.

pak5 contains just the two custom skins.

Select the pak file you want to use then extract the pak file to your Kingpin directory. This will place the pak file in your kingpin/main folder.

If you already have a pak4 or pak5 file in your main folder then extract the new pak4 or pak5 to a temporary folder somewhere and rename it to another number such as pak2, pak3 etc which you don't already have. Then copy it to your kingpin/main folder. 

Enjoy!