Product DescriptionThe Strike Industries SI Strike Rail is a lightweight, high-strength handguard designed for AR-15 style rifles, built to meet demanding duty-focused requirements. This M-LOK compatible rail features a 1.57-inch internal diameter for suppressor or Oppressor compatibility, ambidextrous QD socket placement for sling flexibility, and an integrated anti-rotation feature to help keep the rail securely aligned. An included aluminum barrel nut supports a durable, streamlined setup with only the features you need.Product Highlights 15.5-inch M-LOK compatible handguard for AR-15 platform rifles 1.57-inch internal diameter supports suppressor or Oppressor compatibility Ambidextrous QD socket placement for versatile sling mounting Built-in anti-rotation feature helps keep the rail properly indexed Includes an aluminum barrel nut for a lightweight, durable installation Specs Brand Name: Strike Industries Product Type: M-LOK handguard / rail Platform Compatibility: AR-15 style rifles (not compatible with AR-10 receivers) Length: 15.5 in Color/Finish: Flat Dark Earth (FDE) Mounting Interface: M-LOK Internal Diameter: 1.57 in Sling Attachment: Ambidextrous QD socket placement Anti-Rotation: Built-in anti-rotation feature Barrel Nut: Aluminum Manufacturer Part Number: SI-StrikeRail-155-FDE UPC: 708747547221 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.