Stern Defense RAB-AD Rapid Attach Buttstock Adapter for Pic Rail Black 008-SD RAB-AD-PIC RAIL-D1-M. It allows for the attachment and removal of your buttstock or pistol brace in seconds. To detach pull the bottom release taband 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 Pic Rail both robust and lightweight. The RAB-AD Pic Rail is designed for firearms utilizingMIL-STD-1913 (Picatinny rail) railed receivers. Compatible with RAB-AD MINI to adapt railed receiver to buffer tube style stock . Specifications for Stern Defense RAB-AD Rapid Attach Buttstock Adapter for Pic Rail: Manufacturer: Stern Defense Color: Black Fabric/Material: 7075 Aluminum Weight: 3.7 oz Features of Stern Defense RAB-AD Rapid Attach Buttstock Adapter for Pic Rail 3 steel ball detents and locking bolt for a secure lock up Package Contents: Stern Defense RAB-AD Rapid Attach Buttstock Adapter for Pic Rail Stern Defense 008-SD RAB-AD-PIC RAIL-D1-M: RAB-AD Rapid Attach Buttstock Adapter for Pic Rail Black