This is a Noveske Stripped Lower Receiver known as the Gen 3 chambered in 223 Remington, model 04000008K.
The Noveske Gen III lower receiver is precision machined from billet aluminum. It features a flared magwell and integrated trigger guard. Includes a tension screw to ensure snug fit with upper receiver.
Features:
Hard Coat Type III Anodized
Integrated Trigger Guard
Includes Tension Screw