These both came out very nice. Great job on the ROK MERDC paint scheme.
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However there not too many aftermarket stuff, some PE and resin stowage, but no barrels...
As to AM for them, there is actually quite a bit, you just have to know where to look.
For the K9, DEF Model does a resin and PE update set that is quite extensive. It includes new rear baskets, a resin barrel and mantlet, new sprockets, new commander's cupola and weapons, etc. D-Toys also does a ROK Marine conversion which has resin, PE, and decals and includes a resin crewman as well. Orange Hobby has a metal barrel set and both Orange Hobby and MK1 Design offer PE sets for it. I don't know of any replacement track for the K9.
For the K1A1, Legend has an extensive resin stowage set that includes a whole new rear turret basket assembly full of gear. There is also a PE set from MK1 Design. The barrel for the K1A1 is the same barrel as an M1A1, an M256 barrel. Voyager, RB Model, and Orange Hobby all offer metal/resin M256 barrels. Trumpeter makes replacement, indi-link plastic T156 tracks for the K1A1.