The FAB Defense Standard Picatinny Rail was designed especially for the M16/M4/AR-15, but also fits many other weapons with small modifications. 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