Here’s one that popped into my inbox, the Irene Adaptive Sling (IAS) sling from Mission Spec. Made in the USA it’s designed to be a multifunctional adaptive sling. The sling is priced at 34.95USD and available in three colours.
Whilst intended for LEO and military use it certainly would be attractive to Airsofters out there.
Their video really does show it off better than I can describe it on the news page: