I use a Tucker & Byrd leather sling, well padded and high quality leather with a thumbhole in just the right spot for comfortable carry all day. Not my duty sling which is a Blueforce Vicker's padded for both AR's and long range rifles.
https://www.tuckerandbyrd.com/products.php?cat=27
https://www.tuckerandbyrd.com/products.php?cat=27