A firearm handguard assembly attachable to a receiver of a barrel of a firearm is disclosed. The firearm handguard assembly includes a barrel nut member, a locking sleeve member, a firearm handguard member and a plurality of fasteners. The locking sleeve member is disposed within an axial passage formed by the barrel nut member. A plurality of radial passages of the locking sleeve member are aligned with a plurality of radial passages of the barrel nut member. The firearm handguard member is arranged about the barrel nut member and the locking sleeve member such that the barrel nut member and the locking sleeve member are arranged within an axial passage of the firearm handguard member. The plurality of fasteners join the firearm handguard member to the barrel nut member and the locking sleeve member.