This Rear Receiver QD Swivel Attachment Point provides for ambidextrous attachment of the popular push button sling swivel. AR Receiver End Plate CNC machined 4140 steel thru hardened to 38-42 HRC Hardend QD Sling Swivel Socket Mil Spec Manganese Phosphate Coating All Steel Construction allows for proper staking Uses standard QD Swivel (Not included) Gunsmith/Armor Installation NOT required MADE IN USA