What's in the Box ARCA Rail Section (4) Button Head Screws, M4x0.7 1/8" Hex Wrench 2.5mm Hex Wrench Proudly designed and made in the USA, this CNC-machined ARCA rail is built from 7075-T6 aluminum and finished in a durable matte black anodize. The contoured profile prevents snagging and discomfort when shooting unsupported, while laser-engraved positional markings provide precise and repeatable mounting. Designed to integrate seamlessly with M-LOK systems, this rail forms a continuous surface when multiple sections are installed in line and is compatible with standard ARCA, R-LOCK, and MRAS QD mounts. Firearm Features CNC-machined 7075-T6 aluminum construction Matte black anodized finish M-LOK interface for flexible mounting Contoured profile to reduce snagging Laser-engraved positional indicator markings Forms continuous rail when installed in series Compatible with ARCA, R-LOCK, and MRAS QD systems Firearm Specifications Manufacturer: Made in USA Model: ARCA M-LOK Rail Material: 7075-T6 Aluminum Mount Type: M-LOK Modular System: ARCA Surface Finish: Anodized Color: Black Installed Length: 8" Overall Length: 7.87" Width: 1.50" Height: 0.32" Weight: 2.6 oz Rail Space Required: 5 M-LOK Slots