The GR-03 is the same as the GR-02 kit at Gunner Airsoft, the only difference is the wooden hanguard... "Chinese Made All Steel Conversion kit. All steel, means this has the CNC steel receiver, gas block, outer barrel, rear stock, or say, everything STEEL. Complete clone of inokatsu steel kit, only a fraction of their price. You'll need an AK hop up / inner barrel assembly, and complete AK gearbox to complete the kit (not included). Now included 1x90rd mid cap magazine!! Very Limited Quantity."