San Tan Tactical STT-15 Pillar Lite Billet Upper Receiver

The San Tan Tactical STT-15 Pillar Lite Billet AR-15 Upper Receiver has innovative weight savings in areas where extra mass isn't needed, and extra strength in areas where it is needed. San Tan's Pillar Upper is CNC machined with the use of 3D CAD modeling software. The Pillar has a new truss system to help distribute weight of longer handguard systems throughout the entire upper receiver instead of putting the entire weight of the handguard on the threads of the receiver. To save weight the forward assist has been removed and the shell deflector has been redesigned.

Caliber: .223/5.56