Sig Sauer P365 Fuse Handgun with Romeo-RS 9mm Luger 17(1)&21(2) Magazines 4.3" Black 3MOA

The Sig Sauer P365 Fuse is a 9mm striker-fired pistol that bridges the gap between full-size shootability and compact concealment. Built on the proven P365 platform, the Fuse delivers a longer sight radius (6.0 inches) and extended slide than other pistols in its class—all while maintaining a razor-thin 1.1-inch grip width. This is the gun for shooters who refuse to compromise: you get the handling and capacity of a duty-size carry gun without the footprint. The Fuse comes optics-ready from the factory, pre-installed with a Sig Sauer Romeo-RS red dot sight and equipped with a fiber-optic front sight and serrated rear sight for fast target acquisition in any light.

Defensive performance is built in. The 4.3-inch carbon steel barrel (DLC-finished for durability) delivers the velocity needed to maximize modern ammunition expansion. The LXG grip module features laser-stippled texture for confident control in stress situations, and the M1913 rail gives you the flexibility to mount lights or lasers. Included are three steel magazines—two 21-rounders and one 17-rounder—giving you genuine flexibility in how you carry and reload. The nickel-plated flat-faced trigger is clean and predictable, and interchangeable small, medium, and large backstraps ensure a custom fit for your hand.

Whether you're configuring a carry gun, a home-defense pistol, or a range workhorse, the P365 Fuse delivers the full-size accuracy and control you'd expect from Sig Sauer, wrapped in a profile that actually fits your daily life. This is what happens when you stop choosing between capability and practicality.

Key Features

• Optics-ready slide with factory-installed Sig Sauer Romeo-RS 3MOA red dot sight
• 6.0-inch sight radius for improved accuracy and sight picture clarity
• 4.3-inch carbon steel barrel with DLC finish for enhanced ballistic performance
• Razor-thin 1.1-inch grip width for genuine concealment without sacrificing capacity
• 21-round magazine capacity (standard) plus two additional magazines included
• Fiber-optic front sight paired with serrated rear sight for quick target acquisition
• LXG laser-stippled grip module with M1913 accessory rail
• Interchangeable backstraps (small, medium, large) for custom hand fit
• Nickel-plated flat-faced striker trigger

Specifications

Frequently Asked Questions

Does the P365 Fuse come with a red dot sight installed?

Yes. The Fuse ships with the Sig Sauer Romeo-RS 3MOA red dot sight already mounted and ready to use. It uses the Shield RMS-c optic footprint, which is compatible with a wide range of aftermarket red dots if you ever want to swap it out.

What magazines come in the box?

You get three steel magazines total: two 21-round magazines and one 17-round magazine. This gives you flexibility in capacity depending on your carry or use situation.

Can I fit a light or laser on the P365 Fuse?

Yes. The Fuse includes an M1913 accessory rail under the barrel, so you can mount any light or laser designed for that standard.

Does the grip come in different sizes?

The grip module comes with interchangeable small, medium, and large backstraps, so you can customize the fit to your hand without buying a new gun.