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The FN Big G-4 medium fish knife is an all-around knife that is perfect for cutting and cleaning medium sized fish, and also serves as a very capable butchers knife for butchering beef and pork. The leaf shaped blade of the G4 is hand forged from spring steel with a hardness of Rockwell 60 and the protective black scale coating from forging helps protect the blade and gives it a more rugged, rustic, and all around more manly look.  Also known as the Taiwan Tuna Knife and can be seen scraping or slicing the scales off fish.


  • Blade: 190 x 75 x 3 mm  / 7.5″ x 3″ x 0.12″
  • Handle Length: 95 mm / 3.75″
  • Overall Length: 285mm / 11.25″
  • Weight: 285 g / 10 oz.

Knife care: Keep clean with warm water and soap. Towel dry immediately. Do not put into dishwasher. The black cladding generally protects the body of the steel from rust, but the exposed edge steel can show signs of surface rust over time. Most surface rust can be removed by the rough side of a sponge or by sharpening the edge.

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 0.7 lbs
Dimensions 12.5 × 4.25 × 1.25 in

Master Kuo


Master Kuo FN Big series

1 review for FN Big G-4 Medium Fish Knife, Butchering Knife, Hand Forged

  1. Watson S

    Best knife for pork cutting. Trust me!

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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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