Nimrod's Wares MAGPUL M-B-U-S Gen2 Rear Flip-Up Back-Up Sight+ Free Micro Fiber Cloth Manufacturer: Magpul Industries Model: M-B-U-S Generation 2 Finish/Color: Black Type: Rear Sight Please note: Includes one Nimrod's Wares Microfiber cloth per order, regardless of quantity purchased.