The AR15 Bar Barrel Nut is used to connect BAR style handguards to standard threaded upper receivers. This product comes with 4 shims to properly time the gas tube with the upper receiver.
BAR Barrel Nut
BAR Shim Pack (4 shims)
Material: Machined from Billet 7075-T6 Aluminum
Coating: Anodized Black
Torque with standard AR15 armorer's wrench