The MFR XL Rail Systems from Daniel Defense utilize the Keymod and M-LOK attachment systems for incredible weight savings as well as superior cooling, ergonomics, and modularity while maintaining the strength and durability expected from Daniel Defense. Keymod attachment points are located on the sides, bottom, and upper 45 positions of the rail while featuring an uninterrupted 1913 Picatinny rail on top. M-LOK attachment points are located along 7 positions on the rail and feature an uninterrupted 1913 Picatinny rail on top. Its sleek bolt-up system increases strength and allows for easy installation. The increased internal diameter gives the operator the ability to attach a suppressor and have the proper clearance needed for installation. Anti-rotation tabs come standard for ease of installation and alignment. The MFR can be used with a pinned low-profile gas block on pistol, carbine, mid-length or rifle length gas systems. Specifications for Daniel Defense MFR XL Rail Systems: Manufacturer: Daniel Defense Color: Black Finish: Military Specification Type III Hard Coat Anodized Fabric/Material: Aircraft Grade 6061-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Gun Rail: Picatinny Condition: New Included Accessories: Standard Mount Type: M-LOK Quantity: 1 Features of: Light Weight Free Floating Barrel Design Steel Barrel Nut Uninterrupted Mil-Spec 1913 Picatinny Upper Rail M-LOK or Keymod attachments on the sides and bottom Patented Bolt-Up Mounting System 1.61" internal diameter designed for use with suppressor Weight Installed = 13.30 oz (with Mounting Hardware) Package Contents: Daniel Defense MFR XL Rail System Daniel Defense Warranty: Guaranteed Satisfaction All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer's products. Warranty information and warranties are supplied solely by the manufacturer, and not this retailer. This retailer publishes information from the manufacturer for information purposes only, and the manufacturer is solely responsible and liable for any warranty information and warranties published by this retailer. Please reference the appropriate manufacturer documents or reach out to the manufacturer directly for full warranty terms and effective dates.