Includes: AR15 Stripped Upper Receiver in Tungsten Cerakote AR15 Gen 2 Stripped Lower Receiver in Tungsten Cerakote Upper Receiver Features: Platform: AR15 Material: Machined from 7075-T6 forged aluminum Coating: Tungsten Cerakote finish (more info on Cerakote) M4 Feedramps .250†takedown pin holes Accepts standard AR15/M16 components Gen 2 Lower Receiver Features: Platform: AR15 Material: Machined from 7075-T6 forged aluminum Coating: Tungsten Cerakote finish (more info on Cerakote) Markings: "Cal Multi" Works with standard AR15 components and magazines Rear takedown pin detent hole is threaded for a 4-40 set screw