Steel ring mounts on telescopic buttstock with Mil-Spec and Commercial tubes using retaining nut (for proper torque special wrench is recommended). Metal pin on the adapter and mating round slot on the buttstock pipe are preventing swivel from slip. Swivel can be mounted on any, left and right side. With this swivel operator can use ether tactical single-point or traditional sling. If needed, ring can be used without swivel with clevises. Installation will take just a few minutes and require special buttstock wrench.