Wolverine MTW Invictus Quad Rail (10")The 10 Invictus Quad Rail features picatinny rails on all four sides. This rail is manufactured in the US by Invictus Manufacturing. *Includes barrel nut. Features Tension Mounting system (no more lock block) Integrated QD sling mounts Picatinny rails on four sides Backward compatible with original MTW barrel nuts Manufactured in house by Invictus Manufacturing, USA 6105 T5 Aluminum Milspec Black anodized Includes Rail Retention Screws x2 (MTW H 223)