The Nighthawk Custom Korth Mongoose is a double-action revolver chambered in .357 Magnum with interchangeable 9mm cylinder capability and a 5.25-inch barrel. It has walnut grips and is built on the German-made Korth platform, imported and finished by Nighthawk Custom. The dual-caliber setup accepts .357 Magnum and 9mm cylinders in the same frame. 
 

Key Specifications 

• Brand: Nighthawk Custom 
• Model: Korth Mongoose 
• Caliber: .357 Magnum / 9mm 
• Action: Double Action 
• Barrel Length: 5.25 inches 
• Grips: Walnut 
   

Detailed Features 

• 5.25-inch barrel 
• Dual-caliber: .357 Magnum and 9mm cylinders 
• Walnut grips 
• Double-action revolver 
• Korth-platform construction

Owners of the Nighthawk Custom Korth Mongoose describe the action as among the smoothest double-action triggers they have experienced in a production revolver. The Korth mechanism is consistently cited as the primary reason to buy, with the double-action pull drawing comparisons well above the typical factory revolver offering.

The dual-cylinder arrangement for .357 Magnum and 9mm is a practical feature that owners appreciate. Walnut grips feel substantial and fit most hand sizes well, though some note the grip geometry takes adjustment for those coming from other platforms. At this price tier, build quality expectations are high and the Mongoose generally meets them.

Criticism centers almost entirely on price and availability. The Mongoose is expensive relative to domestic alternatives, and some owners debate whether the Korth engineering premium translates to a proportional practical improvement for range or carry use. Those who buy it for the craftsmanship tend to be satisfied; those who expect performance gains commensurate with cost sometimes feel the gap is narrower than expected.