The Invictus MK1 Rail is manufactured in-house and comes standard on the MTW Billet Series. It includes index tabs, M-LOK slots on 7 sides and a top picatinny rail.
Features:
Tension-Mounting system (no more lock-block)Index tabsLicensed M-LOK slots on 7 sidesBackward-compatible with original MTW barrel nutsManufactured in-house by Invictus Manufacturing, USA6105 T5 AluminumMilspec Black anodizedWeight: 10ozInner diameter: 1.398″ / 35.5mm