The Aero Precision AR-15 BAR Barrel Nut is the perfect way to connect your BAR style handguards to a standard threaded upper receiver. This top-quality product comes with four shims to ensure proper timing of the gas tube with the upper receiver. Installation is easy, so you’ll be up and running in no time. Plus, the black finish looks great and matches most AR-15 platforms. Get the Aero Precision AR-15 BAR Barrel Nut today and be confident in your rifle’s performance!