These.223/5.56 Barrel Nut Washers/Shims are a great compliment to the .223 Free Float Quad Rail . These 0.51mm steel shims fit between the barrel nut and upper receiver to allow the user to adjust the position of the barrel nut. Features like swivel studs, vent openings, and picatinny rails, to the shooters needs. Also eliminates gap between rail and upper receiver. These washers will also ensure a contour fit between barrel nut and upper receiver, eliminating misalignment and instability. Will fit .223, 7.62x39mm, Blackout AAC 300 Won't fit .308 Pack of 10 Pcs per order
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