OTTO Engineering NoizeBarrier Helmet Mount NoizeBarrier TAC Ops Core Black. Specifications for OTTO Engineering NoizeBarrier TAC Helmet Mounts: Manufacturer: OTTO Engineering Quantity: 1 Adjustability: Ops-Core Helmet Gender: Unisex Features of OTTO Engineering NoizeBarrier TAC Helmet Mounts: Patented rail mount frames snap onto pivot point on NoizeBarrier headset earcups Rail mount slides easily onto top or rear rails on Ops-Core/Team Wendy helmet Mounts easily in the field without tools Available in Black and FDE Compartment on each earcup for spare battery to power NoizeBarrier headset Package Contents: OTTO Engineering NoizeBarrier TAC Helmet Mounts OTTO Engineering C102359BK: NoizeBarrier Helmet Mount NoizeBarrier TAC Ops Core Black