The Dirty Bird AR-10 Handguard is our first Free-Floating M-LOK Rail for the AR-10 platform. We took the best functions of our AR-15 Handguards and created an AR-10 rail that we feel is tough, versatile, practical and economical, meant to be used on any build. The SMRS (Slim M-LOK Rail System) by Dirty Bird Industries is a high quality and feature packed M-LOK handguard designed for AR-10 platform rifles and pistols. Tough Machined from aircraft grade 6061-T6 aluminum extrusions. Type 3 hard anodizing or Cerakote™ sprayed at 1 mil thickness per spec. Versatile