Madbull Airsoft Barrel Nut Washer Includes:
Madbull Airsoft Barrel Nut Washer Features:
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.
Alternate Lookup: MB WASHER