This is a Seekins Precision Stripped Lower Receiver known as the NX15 chambered in 223 Remington, model 0011000018.
The NX15 Skeletonized lower is uniquely designed to remove excess weight and materials without sacrificing the rifles integrity. The NX15 lower offers a great foundation for an extremely lightweight" easy to maneuver rifle.
Features:
Mil-Spec Component Compatible
Ambidextrous Bolt Release
7075-T6 Billet Aluminum