This Madbull Barrel Nut Washer is made 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.Package include:
1 x 0.1mm
1 x 0.15mm
1 x 1.5mm
1 x 2mm
Features:
Eliminate gap between rail and upper receiver
Precisely aligns fastening screws on RIS systems
Ensures stability
Prevents RIS from angling during installation
