UltiMAK Saiga Shotgun Optic Mount For Adjustable Rib Models Fits both 12 and 20 gauge Low profile, lightweight, rugged, stable and versatile. Picatinny (1913) style rail mount. Comes with screws, hardware, and instructions. No permanent alterations to your shotgun. Includes integral recoil lug on underside. Replaces sight rib, bolts front and back. Model: M11-S Material: Aerospace-grade 6061-T6 aluminum billet* Finish: MIL STD hard anodizing, non-reflective black matte Made in U.S.A.