This kit contains a machined steel +1 magazine extension with an integrated Dual-Rail Adapter machined from 6061-T6 billet aluminum, as well as a color-matched swivel stud and nylon washer. All items are finished with Cerakote Armor Black ceramic coating to blend with the factory finish and provide durability. This kit is compatible with Remington TAC-14 and may be compatible with other Remington 12-Gauge models. (Optics shown not included.)