Contoured to Prevent Snagging and Discomfort when Shooting Unsupported. CNC Machined 7075-T6 Aluminum Finished in a Matte Black Anodize. M-LOK Interface Spaced for Installation in Complete Slots or in Between Adjacent Slots. Laser Engraved Positional Indicator Markings. Forms a Continuous Rail when Multiple Rails are Installed in Line. Compatible with Standard ARCA, R-LOCK, and MRAS QD Adaptors and Mounts