CK Sling

==Description==
Changes appearance of shotgun .
* The customized item cannot be traded. 
* Only one CK can be applied to an item.
* Removing the CK allows the item to be sold.
==Receiving==
*Purchase at in-game shop for 40 .
*Randomly at opening of .
* Clash of Engineers contest:
** Mobile Base, top 15.
** Cover Car: Wasteland Fire Trucks, top 5.