The Swagger Stalker QD Swivel Stud Adapter is a must have for your Swagger Stalker QD42 or QD72 Bipod. The QD Swivel Stud Adapter allows you to connect either of these Flex Ready Bipods to your AR-15 in a matter of seconds. The QD Swivel Stud Adapter easily connects to your existing swivel stud and is the perfect functional adapter for the AR platform. FeaturesQuick DetachableAR-15 CompatibleFast and Easy Installation