FAB Defense Standard Picatinny Rail for AR-15/M4/M16 Handguards Black. These Picatinny Rails from the revolutionaries at FAB Defense feature a special angle in order to position devices parallel to the barrel. A FAB Defense AR15/M4/M16 Handguard Rail will transform your gun to a weapon capable of mounting various devices. In addition the FAB Defense UPR - Polymer Picatinny Under-Rail is molded from a reinforced polymer composite. Specifications for FAB Defense Standard Picatinny Rail for AR-15/M4/M16 Handguards: Manufacturer: FAB Defense Fabric/Material: Polymer Gun Type: Rifle Gun Model: M4 AR-15 Length: 155 mm 6.1 in Width: 21 mm 0.83 in Height: 16 mm 0.63 in Weight: 0.101 lb 46 g Condition: New Quantity: 1 FAB Defense Standard Picatinny Rail 1S0-T8-UPR164 Designed especially for the M16/M4/AR-15 but also fits many other weapons with small modifications Designed with a special angle in order to position devices parallel to the barrel Transforms your gun to a weapon capable of mounting various devices Molded from a reinforced polymer composite Easy to install Package Contents: FAB Defense Standard Picatinny Rail for AR-15/M4/M16 Handguards FAB Defense fx-uprb: Standard Picatinny Rail for AR-15/M4/M16 Handguards Black FX-UPRB