5.6 Picatinny rail can be easily installed on an existing AR15/M16 Carbine/rifle handguard. - Single Picatinny rail screws into existing vent holes on the handguard - Fits most handguards - Excellent for mounting lasers flashlights vertical grips pods and more - Fits: M16/AR15/M4 - Number of Rails: 1 - Made of: Polymer - Weight: 1.6 oz - Width: 0.8125 - Length: 5.675 - Height: 0.375