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- 5KU Aluminum Outer Barrel (2 Length Set). - Aluminum Construction. - Two-Piece Barrel Design (235mm Outer Barrel + 130mm Extension). - Form your WA M4 as CQB-R/M4A1/M16A2 Carbine as your choice. - Design for WA M4 Series Airsoft Gas Blow Back Gun GBB Rifle. - 14mm Counter-Clockwise Barrel Thread. - Include Spacers. - Model no. - GB-129-B - Color - Black - Weight - Approx 165g - Barrel Thread Diameter - 14mm - Adaptive End - 14mm Counter-Clockwise - Original Packing - Suitable for outdoor war game activities.