Internal Upgrade Parts External Upgrade Parts Suppressor BB and Hi-Cap magazine Reinforcement     JA-01   363mm Tight Bore 6.03mm Barrel   details   JA-02   455mm Tight Bore 6.03mm Barrel   details   JA-03   229mm Tight Bore 6.03mm Barrel   details   JA-04   509mm Tight Bore 6.03mm Barrel   details   JA-05   Handguard Adjustment Tool   details   JA-06   Steel Armored Flashhider   details   JA-07   M16 Front Sight   details   JA-08   247mm Tight Bore 6.03mm Barrel   details   JA-09   407mm Tight Bore 6.03mm Barrel   details   JA-10   550mm Tight Bore 6.03mm Barrel   details   JA-11   Cylinder head Ver. II   details   JA-12   Piston head   details   JA-13   Cylinder head set Ver. II   details   JA-14   Cylinder, Standard 2 Port   details   JA-15   Cylinder, full capacity   details   JA-16   273mm Tight Bore 6.03mm Barrel   details   JA-17   CQB Reinforced Barrel set   details   JA-18   M4A1 Reinforced Barrel set   details   JA-19   M16 Reinforced Barrel Set   details   JA-20   M4 CQB-R Outer barrel   details   JA-21   M4A1 Outer barrel   details   JA-22   M16 Outer barrel   details   JA-23   Ver. II Spring Guide   details   JA-24   Ver.III Spring guide   details   JA-25   M100 Spring   details   JA-26   M120 Spring   details   JA-27   Shim Set   details   JA-28   Version III Cylinder Head   details   JA-29   Cylinder Head Set Version III   details   JA-30   M4/M16 Series Air Nozzle