FAB Defense Double Picatinny Rail for AR-15/M16/M4 Standard Handguard Black. These Picatinny Rails fit all M16 / AR15 / M4 standard handguards. Mako Group Double Picatinny Rail is very convenient. It can be mounted on upper handguards and lower handguards as well. Picatinny Rail from FAB Defense allow most of the handguards to be free for grips bipods and other attachments. Mako Group AR15/M16/M4 Picatinny Rails provide excellent positioning for operating flashlights lasers and canted grips. In addition these Picatinny Rails from FAB Defense are built from strong and durable reinforced polymer. Specifications for FAB Defense Double Picatinny Rail for AR-15/M16/M4 Standard Handguard: Manufacturer: FAB Defense Fabric/Material: Polymer Gun Model: AR-15 Features of FAB Defense Double Picatinny Rail for AR-15/M16/M4 Standard Handguard: Fits all M16 / AR15 / M4 standard handguards Provides two 45 degree rails for accessories Can be mounted on upper handguards and lower handguards as well Provides excellent positioning for operating flashlights and lasers and canted grips Allows most of the handguards to be free for grips bipods and other attachments Built from strong and durable reinforced polymer Package Contents: FAB Defense Double Picatinny Rail for AR-15/M16/M4 Standard Handguard FAB Defense fx-dprb: Double Picatinny Rail for AR-15/M16/M4 Standard Handguard Black FX-DPRB