Our Universal Mounting Rail (UMR) system is an extremely versatile, rugged and easy system for attaching just about any accessory to your rifles forend. The standard length UMR has two QD cups and two MLock slots allowing multiple mounting options for just about any popular understock accessories. The UMR is CNC machine from aircraft grade aluminum and coated with a durable and attractive Cerakote finish. Our UMR can be installed on most stocks however, inletting is required and the addition of fill material may be necessary on hollow, polymer stocks. Please contact us with any questions about compatibility. Comes complete with all mounting hardware.