This is an AR-15 stripped lower receiver by DPMS. Great lower to start your build on. DPMS receivers are CNC machined from quality 7075 T6 aluminum forgings for reliable performance and outstanding durability. Machined to Military Specifications & Standards and can be used with multiple calibers on the AR-15 platform. Comes with milspec trigger group, lower parts and m4 milspec stock kit installed. **OPTIONAL**: UPGRADE STOCK to a JE Machine Tech SOPMOD stock