The M-LOK system offers a new modular mounting system for accessories developed by MAGPUL. All M-LOK free float forends include a M-LOK accessory rail (with M-LOK nuts) forend adapter barrel nut Vibra-Tite and 6 6-32 screws. - Technical Specs - Free float. - Weight: 11.85 oz - Made from 6005-T651 Aluminum. - Inside diameter: 1.6 - Outside diameter: W-1.8 H-2.1 - Engineered with advanced ergonomics for comfort and improved performance. - Continuous/uninterrupted Picatinny Rail across the top. - Accessory rails can be placed at 3 6 and 9 o'clock positions and can be joined to create continuous Pic Spec Rail. - QD sling mount positions at 3 and 9 o'clock. - Engineered to allow for low profile gas block to fit inside. - M-LOK is a modular locking accessory mounting system developed by MAGPUL. - Adjusts in 1/2 slot increments for precise accessory placement. - No access to back side of the rail is required. - Accessories can mount with either end facing forward. - Works with both metal and polymer accessories.