Madbull Barrel Nut Washer (2mm/1mm/0.15mm/0.1mm)

Main Function: to eliminate gap between rail and upper receiver. These washers will ensure a contour fit between barrel nut and upper receiver, eliminating misalignment and RIS instability. The MB Barrel Nut Washers come in 4 sizes to fit many different configurations. Madbull Barrel Nut Washer (2mm/1mm/0.15mm/0.1mm) Eliminate gap between rail and upper receiver Precisely aligns fastening screws on RIS systems Ensures stability Prevents RIS from angling during installation 1 x 0.1mm 1 x 0.15mm 1 x 1.5mm 1 x 2mm