KNS Precision Quick-Disconnect Swivel Socket Adapter Black QD ADAPTER. 250 Push Button Pins w/Stud for the AR-15. This socket adapter simply replaces the sling stud adapter on the .250 AR-15 pin to offer an alternative quick-release sling mounting solution. QR SWIVEL NOT INCLUDED Specifications for KNS Precision Quick-Disconnect Swivel Socket Adapter: Manufacturer: KNS Precision Color: Black Diameter Compatibility: 0.25 in Country of Origin: USA Gun Type: Rifle Gun Model: AR-15 Package Contents: KNS Precision Quick-Disconnect Swivel Socket Adapter What firearm models does the manufacturer say KNS Precision Quick-Disconnect Swivel Socket Adapter is compatible with? The manufacturer says that KNS Precision Quick-Disconnect Swivel Socket Adapter is compatible with AR-15KNS Precision QD ADAPTER: Quick-Disconnect Swivel Socket Adapter Black