The San Tan Tactical STT-15L Lite PILLAR Billet AR-15 Upper Receiver features the same design and characteristic as the standard STT-15 Upper; however, the STT-15L is significantly lighter in weight. By removing the forward assist, the weight on this product is reduced even further. This stripped upper weighs a mere 6.9 ounces instead of the 8.2-ounce weight of the standard STT-15 Upper. Features – San Tan Tactical Truss Pockets for Increased Structural Rigidity – Cut from a Single Billet 7075 -T6 Aerospace Grade Aluminum – Shell Deflector