This is a San Tan Tactical Stripped Lower Receiver known as the STT-15 chambered in 223 Remington, model STT-15L-LT-LWR.
San Tan Tactical believes in America" and the heritage upon which this great nation was built. They only use the highest quality machine's in conjunction with the highest quality American made materials.
Features:
Lightweight
Integrally Machined Magazine Well Flare
Oversized Winter Trigger Guard