Energetic Armament Lux. Tubeless welded titanium construction. 1.375x24 universal mount interface with fixed end cap. Interior finished with S-Line (boron nitride). Exterior finished with DLC PVD (diamond-like carbon). Ships with 5/8x24 direct thread mount. Patented Serial ID ring. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor