The Phase 5 Sloped Quick Disconnect End Plate for AR-15 has a built in QD Sling Swivel. Built from sturdy 7075-T6 billet aluminum construction that is about 80% stronger than 6061-T6 aluminum. The aluminum construction weighs less than a standard stamped steel end plate (0.39 oz vs 0.48 oz). The QD mount is at a 30 Degree angle from the lower receiver to allow a 360 Degree rotation for ambidextrous use. Uses a standard AR-15 carbine castle nut (not included) and is compatible with both Mil-Spec and Commercial buffer tubes.