The O2 Lite is the latest and lightest of all the ODIN Works forends. Precision machined from 6005-T651 the O2 lite is a full 20% lighter than its predecessors. All ODIN Works forends are free floating for accuracy and hard anodized for durability. - Technical Specs - Free float. Made from 6005-T651 Aluminum. - Weight: 7oz - Hardware weight: 2.7oz - Inside diameter: 1.6 - Outside diameter: W-1.8 H-2.16 - Engineered with advanced ergonomics for comfort and improved performance. Accessory rails can be placed at 3 6 and 9 o'clock positions and can be joined to create continuous Pic Spec Rail. Four or more QD attachment points. Made to fit Magpul QD. - Engineered to allow for low profile gas block to fit inside.