Designed After The SBM4 5-Position Adjustable Integral, Ambidextrous QD Sling Socket **Buffer Tube Not Included Designed For All Platforms Capable Of Accepting A Mil-Spec Carbine Receiver Extension, The SBA4 Is 5-Position Adjustable And Features An Integral, Ambidextrous QD Sling Socket.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }