ACCU-TAC Arca Sling Stud Rail Adapter Black. The adapter allows you to use your sling stud to mount your Accu-Tac bipod. It is CNC machined and coated with mil-spec hard anodize. Specifications for ACCU-TAC Arca Sling Stud Rail Adapter: Manufacturer: ACCU-TAC Color: Black Length: 3.5 in Finish: Type III Hardcoat Anodized Fabric/Material: 6061 Aluminum Alloy Stainless steel hardware Width: 1.4 in Height: 1.25 in Size: Small Package Contents: ACCU-TAC Arca Sling Stud Rail Adapter Necessary hardware for installation ACCU-TAC ASSRA-300: Arca Sling Stud Rail Adapter Black