Do you already have the Paracord or you looking for something that includes that as well? A quick search on Amazon; they have Do-It-Yourself Kits that includes the strap, #550 Cord, and the Swivel Connector. Just search "DIY gun sling Paracord" and you will see some results that may fit what you are looking for.
The swivel connectors are the parts you need not so much the cord. I just king cobra them or any other flat weave as people want them to lay comfortably across their shoulder
Hello, Try visiting this link: http://www.paracordplanet.com/DIY-Adjustable-43-Paracord-Multi-Purpose-Sling-Kit_p_3392.html It allows you to build the sling with the colors you desire, select the color strap, and the swivel connect color.