The product you're describing is the Arisaka Defense Rail Slider Picatinny Rail designed to fit M-Lok handguards with an integrated QD (Quick-Detach) mount. Here are the details based on the information you provided :
Brand: Arisaka Defense
Product Name: Rail Slider Picatinny Rail
Compatibility: Fits M-Lok handguards with an integrated QD mount
Rail Length: 8 Slot
Finish: Anodized Finish in Black
Model Number: RS-RAIL-8M
Key features :
Compatibility: The rail slider is designed to fit M-Lok handguards that come with an integrated QD mount. M-Lok is a popular accessory attachment system, and the integrated QD mount allows you to quickly attach and detach compatible QD sling swivels for improved sling mounting options.
Rail Length: The rail is designed with 8 slots, providing a platform for attaching Picatinny-compatible accessories such as lights, grips, bipods, or other rail-mounted gear.
Anodized Finish: The black anodized finish offers durability and corrosion resistance, providing both protection and a sleek appearance to the rail.
Model Number: The model number RS-RAIL-8M corresponds to this specific rail slider designed for M-Lok handguards with an integrated QD mount.