UTG PRO M-LOK Arca Rail, 7075-T6, 3.1" Length Proudly Designed and Made in USA 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