Description Radian Weapons ADAC15 Multicaliber lower receiver that can be chambered in .223, 5.56, .300 blackout, etc… Machined from billet 7075-T6 aluminum with fully ambidextrous Radian controls. Radian talon 45/90 degree safety selectors long/short (not installed), left side magazine release, right side bolt release, and ambidextrous dual action catch. Enhanced takedown pins. Self-adjusting receiver tensioner, which is a spring loaded plunger to reduce the wobble between the upper and lower receiver. Comes in its factory box with small lower parts kit. Must ship to a FFL holder. Condition: New in box. Serial: R1-001979 Manufacturer: RADIAN WEAPONS Caliber: .223, 5.56, .300 BLK Model: ADAC15 Book# 04355