San Tan Tactical STT-15 Pillar Billet Upper Receiver Black. San Tan Tactical crafted these AR15 Upper Receivers from skeletonized aircraft-grade aluminum with 3D CAD modeling software to create a lightweight and strong foundation for your rifle. This San Tan Tactical STT-15 Pillar Billet AR-15 Upper Receiver features a patented truss design that distributes stress across the entire platform of the receiver - not just the threaded areas. By employing this method of construction the upper receiver weighs only 8.2 ounces which is lighter than some slick side uppers on the market. You can also save weight in key areas by using the forward assist block and shell deflector. Create a more precise shooting experience with the San Tan Tactical STT-15 Pillar Billet Rifle Upper Receiver. Specifications for San Tan Tactical STT-15 Pillar Billet Upper Receiver: Manufacturer: San Tan Tactical Color: Black Finish: Hard Coat Gun Make: AR Platform Gun Model: AR-15 Additional Features: Truss Pockets Condition: New Gun Type: Rifle Package Contents: San Tan Tactical STT-15 Pillar Billet Upper Receiver What firearm models does the manufacturer say San Tan Tactical STT-15 Pillar Billet Upper Receiver is compatible with? The manufacturer says that San Tan Tactical STT-15 Pillar Billet Upper Receiver is compatible with AR-15San Tan Tactical STT-PILLAR-1: STT-15 Pillar Billet Upper Receiver Black