The Sig Sauer P365 Fuse is a compact striker-fired pistol chambered in 9mm Luger with a 4.30-inch black DLC barrel and a 21+1 capacity. It has a black Nitron stainless steel serrated slide and a black DLC stainless steel frame with a beavertail and Picatinny rail. The pistol ships with the Romeo-X optic installed on the optics-ready slide. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P365 Fuse 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 21+1 
• Barrel Length: 4.30 inches 
• Color/Finish: Black (DLC / Nitron) 
   

Detailed Features 

• Striker-fired action 
• Romeo-X optic included 
• Optics-ready serrated slide 
• Black DLC barrel and stainless steel frame with beavertail 
• Picatinny rail on frame

The P365 Fuse owners are generally pleased with the Romeo-X optic included from the factory. Getting a pistol and optic as a matched system at a single price point is a frequent highlight in owner feedback. The 21+1 capacity in a compact-size package is also a recurring point of satisfaction.

The 4.30-inch barrel gives the Fuse a slightly longer sight radius than the standard P365, and striker-fired shooters adapt to it quickly. The beavertail on the frame gets positive mentions for grip comfort and reducing muzzle flip.

Some owners find the overall package larger than expected for a P365 variant, which affects concealability compared to the base model. The Romeo-X dot size and zero retention after hard use are minor concerns that appear in mixed owner reports.