Fostech MACH-2 AR-15 Tactical Rail 13in Tungsten. Weighing in at nearly 30percent lighter the Fostech Mach-2 LITE rail reduces the weight of your next build You won't believe the weight difference when you get this rail Specifications for Fostech MACH-2 AR-15 Tactical Rail: Manufacturer: Fostech Fabric/Material: Lite Alloy Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Gun Rail: Picatinny Mount Type: M-LOK Quantity: 1 Features of Fostech MACH-2 AR-15 Tactical Rail Lightweight Package Contents: Fostech MACH-2 AR-15 Tactical Rail Fostech 6700-TUN: MACH-2 AR-15 Tactical Rail 13in Tungsten