Matrix Arms AR-15 Charlie M-LOK Handguard 13.5in Black. Matrix Arms rails have a durable solid structure and quality finish. A continuous Mil-Spec 1913 topside Picatinny rail and multiple M-LOK slots offer the ultimate base for customizations such as lights sights and scopes. The Charlie model offers a flat end cut to showcase your uppressor. A straight-forward installation process lets you get to the field without any complications. Requires 9/64 Allen key and 1-3/16th crowfoot wrench for assembly not included. Specifications for Matrix Arms AR-15 Charlie M-LOK Handguard: Manufacturer: Matrix Arms Color: Black Finish: Hardcoat Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Handguard Type: Free-Float Gun Rail: Picatinny Gas System Length: Pistol Length Mount Type: M-LOK Package Contents: Matrix Arms AR-15 Charlie M-LOK Handguard Matrix Arms MHG15-C13: AR-15 Charlie M-LOK Handguard 13.5in Black