ZRODelta V4 MLOK Rail 15in Black Medium. Their V5 rails feature a streamlined profile inspired by the LVOA and interrupted top rail creating a lightweight system with rails just where you need them and attachable MLOK sections available for purchase so you can have rail sections everywhere you want them. Specifications for ZRODelta V4 MLOK Rail: Manufacturer: ZRODelta Color: Black Fabric/Material: 6061-T6 Aluminum Gun Rail: M-LOK Weight: 13.4 oz Last Chance: Yes Features of ZRODelta V4 MLOK Rail MLOK attachment on 3 surfaces all sides but top rail Anti-rotation tabs on the rear. Fit perfectly on mil-spec sized uppers may require minor fitting on some bulkier billet uppers. Interrupted top rail for a streamlined look when paired with a flat top upper receiver Reinforced anti walk lock-nut prevents rail movement even under the harshest conditions Package Contents: ZRODelta V4 MLOK Rail All hardware ZRODelta 7048-0025-4101: V4 MLOK Rail 15in Black Medium