American Built Arms Company Polymer Picatinny Rails M-LOK Combo Pack 4 5 7 Slot Black. Specifications for American Built Arms Company M-LOK Combo Pack Polymer Picatinny Rails: Manufacturer: American Built Arms Company Color: Black Fabric/Material: Fiber-Reinforced Polymer Gun Rail: Picatinny Hand: Ambidextrous Gun Type: Rifle Length: 6 in Width: 3 in Height: 0.65 in Weight: 1.75 oz Additional Features: 7-slot Quantity: 3 Features of American Built Arms Company M-LOK Combo Pack Polymer Picatinny Rails Light weight polymer material reinforced with high strength fibers Continuous Mil Spec Picatinny rail designed to deliver maximum reliability This product is the combo pack that comes with the 4 5 and 7 slot rails complete with M-LOK mounting hardware These M-LOK Picatinny rails are not compatible with the AB Arms MOD 1 or AB Pro carbine hand guards Package Contents: American Built Arms Company M-LOK Combo Pack Polymer Picatinny Rails American Built Arms Company ABAMRC: Polymer Picatinny Rails M-LOK Combo Pack 4 5 7 Slot Black