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The FN Big G5 Large Butchering & Taiwan Tuna Knife is hand forged by Master Kuo from spring steel and has a RC hardness of 60-61. The black scale from the forge forms a natural protective coating that keeps the blade from rusting. It gives them a more rugged, rustic, and all around more manly look, too.

The FN Big series is a collaboration between Jende and Master Kuo to make some seriously large Taiwan Tuna Knives. These really big knives are used on larger fish like Tuna, Mahi, Grouper, etc., it is used to zip through long lateral, sectioning cuts while also chopping where needed.


  •  Blade: 200 x 120 x 4.5 mm / 8″ x 4.75″ x 0.18″
  • Handle Length: 100 mm / 4″
  • Overall Length: 305 mm / 12″
  • Weight: 525 g / 18.5 oz

Knife care: Keep clean with warm water and soap. Towel dry immediately. Do not put into dishwasher.The edge steel can show signs of surface rust over time. Most surface rust can be removed by sharpening the edge or using a scotchbrite pad.

Master Kuo knives are some of the sharpest factory sharp knives we’ve ever seen, but they are capable of even more after our professional sharpening services. We recommend the 2000 and 5000 Grit services for this knife. You can also add a custom made leather sheath.

Kuo Chang-Shi is most famous for forging the original Green Sword of Destiny from the 2000 movie “Crouching Tiger, Hidden Dragon”. His Damascus steel designs incorporate human bones and ashes to imbibe the spirit into the piece, as well as to add some elemental strength to the steel (such as manganese and phosphorus), which is based on historical accounts in ancient Chinese sword making.


Weight 1.5 lbs
Dimensions 14.5 × 8.5 × 1.5 in

Master Kuo


Master Kuo FN Big series

1 review for FN Big G-5 Large Butchering & Taiwan Tuna Knife, Hand Forged

  1. Harry

    The wife bought me this knife as a birthday gift. The sheath also had my name custom engraved on it. This is the most pampered thing on the boat now – after my wife!

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Shipping to USA

Most Domestic USA orders ship within 72 hours of ordering from our Colorado location via USPS. You can track your order from this Link

Shipping International/ outside of USA

Most International orders ship within 72 hours of ordering from our Taiwan location via Chunghwa Post. You can track your order from your countrys postal website or from this Link

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