Seekins Precision M-LOK 13 Slot Rail Section, Aluminum, Black 0010560083 Seekins Precision M-LOK Accessory Rail Sections provide the best picatinny mounting system for accessories on any M-LOK compatible handguard. Machined to Seekins Precision's renowned accuracy standards" the rail is constructed of 6061-T6 aluminum and hard coat anodized in matte black. These rails also feature an alignment stud that prevents unwanted movement. Engraved to show proper mounting direction and designed to be attached without having to remove or reach inside the handguard.