SIERRATAC Non-Padded Sling The SIERRATAC Sling, by Spiritus Systems. Every now and then Spiritus discovers a product that is just too good to not use themselves. Spiritus strives to not saturate the market with products that fill a gap that has already been filled by someone else. They have been getting asked for a sling for a long time, and they are pleased to have teamed up with SIERRATAC to provide you with the best sling on the market. The Sling was developed and field tested by professional end users in both the LEO and Military realms. Every detail of the sling was meticulously thought out to provide the end user with an optimal solution for securing their weapon. Mak Mfg: Spiritus Systems