Stern Defense RAB-AD Rapid Attach Buttstock Mini Adapter Mini Black 008-SD RAB-AD-MINI-D1-M. It allows for the attachment and removal of your buttstock or pistol brace in seconds. To detach pull the bottom release tab and twist counter-clockwise 30 degrees. The stock will then be separated from the firearm. To re-attach align the two pieces push in and turn clockwise 30 degrees. The steel locking mechanism automatically secures the adapter. It's7075 aluminum construction and steel internals make the RAB-AD Mini both robust and lightweight. The RAB-AD Mini's designed for firearms utilizing AR style buffer tube stocks that do not require retention of a buffer weight and spring. The RAB-AD Mini is compatible with RAB-AD Pic Rail to adapt buffer tube style stock to railed receiver. It is not compatible with standard AR15 rifles as it cannot retain the buffer weight and spring. Specifications for Stern Defense RAB-AD Rapid Attach Buttstock Mini Adapter Mini: Manufacturer: Stern Defense Color: Black Fabric/Material: 7075 Aluminum Weight: 2 oz Features of Stern Defense RAB-AD Rapid Attach Buttstock Mini Adapter Mini 3 steel ball detents and locking bolt for a secure lock up Package Contents: Stern Defense RAB-AD Rapid Attach Buttstock Mini Adapter Mini Stern Defense 008-SD RAB-AD-MINI-D1-M: RAB-AD Rapid Attach Buttstock Mini Adapter Mini Black