Sig Sauer P365 365Xf9Bforxx 9Mm 4.3 Or 17R/21R

The Sig Sauer P365 FUSE 9mm is a striker-fired compact pistol that bridges the gap between concealment and full-size firepower. Built on the proven P365 platform, the FUSE combines a 4.3-inch carbon steel barrel with a 6.875-inch optic-ready slide—longer than most compact-class alternatives—to deliver the sight radius and handling of a full-size duty gun in a package thin enough for reliable everyday carry. With a 21-round capacity paired to a grip module just 1.1 inches wide, this 9mm pistol lets you carry serious ammunition without sacrificing concealability or shootability.

The FUSE ships with two 21-round and one 17-round steel magazines, giving you flexibility for duty, practice, or backup situations. Its carbon steel barrel carries a tough DLC finish, the slide is aggressively serrated Nitron steel, and the LXG grip module features laser-stippled X-pattern texture to keep the gun secure in your hands. A nickel-plated flat-faced trigger provides a clean, predictable break, while the fiber-optic front sight pairs with a black serrated rear sight for fast sight acquisition in variable light. The gun ships optic-ready with the ROMEO-X Compact already mounted—no additional setup needed if you want to run a red dot from day one.

The P365 FUSE is unapologetically built for shooters who refuse to compromise. Its M1913 accessory rail, included small/medium/large backstrap options, and removable magwell make it easy to tailor the gun to your hand and your mission. At 24.8 ounces and measuring 7.2 inches overall, it's light and short enough for concealed carry, yet substantial enough to control under fire. This is a workhorse—whether you're training at the range, carrying for personal defense, or building a reliable do-it-all defensive platform.

Key Features

• Optic-ready slide (ROMEO-X Compact pre-installed) with ROMEO-X Shield RMS-c footprint
• 6.875-inch slide with aggressive serrations and Nitron finish for durability and control
• 4.3-inch carbon steel barrel with DLC finish for improved ballistic performance
• 21-round capacity with 1.1-inch slim grip module—full-size power, compact width
• LXG laser-stippled grip with M1913 accessory rail and removable magwell
• Interchangeable small, medium, and large backstraps for custom fit
• Nickel-plated flat-faced trigger for a clean, predictable break
• Fiber-optic front sight with black serrated rear sight
• Striker-fired action with no manual safety
• Ships with (2) 21-round and (1) 17-round steel magazines

Specifications

Frequently Asked Questions

What red dot sight does the P365 FUSE come with?

The P365 FUSE ships with the ROMEO-X Compact optic pre-installed. It uses the Shield RMS-c footprint, so it's compatible with a wide range of direct-mount red dots that share that mounting pattern.

Can I use this pistol for concealed carry and still have good capacity?

Yes. The FUSE is designed for exactly that trade-off. Its 1.1-inch-wide grip module keeps it thin and concealable, while the 21-round magazine capacity and 4.3-inch barrel give you the firepower and sight radius you'd expect from a much larger gun. Two 21-round mags and one 17-round mag come in the box.

What backstrap sizes come with the P365 FUSE?

Three interchangeable backstraps (small, medium, and large) are included so you can dial in the grip-to-trigger-guard fit that works best for your hand.

Is the barrel threaded for a suppressor?

No, the P365 FUSE does not have a threaded barrel.