IMI Defense 4 Notch M-LOK Rail Section w/ Integrated QD Port Aluminum. The IMI Defense High-quality multi-lengthM-Lok rail sections -4 notches with integrated QDport Specifications for IMI Defense 4 Notch M-LOK Rail Section w/ Integrated QD Port: Manufacturer: IMI Defense Finish: Matte Fabric/Material: Polymer Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Length: 5 in Weight: 23 g Features of IMI Defense 4 Notch M-LOK Rail Section w/ Integrated QD Port Made from high quality temperature resistant polymer compound Captive Allen mounting screws Tight fit profile alignment stud for solid attachment and recoil absorption Mil-Spec 1913 Picatinny rail profile Compatible with M-LOK Package Contents: IMI Defense 4 Notch M-LOK Rail Section w/ Integrated QD Port IMI Defense 14449: 4 Notch M-LOK Rail Section w/ Integrated QD Port Aluminum