Handguns/Pistols | Semi-AutomaticSig SauerSold by Sportsmans Guide

Sig Sauer

P365-FUSE Romeo-X Semi-auto 9mm 4.3" Barrel 21+1 Rounds

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Striker-fired 9mm

A compact frame and full-size

Includes Installed

Romeo-X Compact red dot for

4.3" Carbon

Steel DLC barrel and stainless

Fiber Optic

A black serrated rear sight

Comes Two

Two 21-round magazines and one

$999.99
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SKU: WX2*0748101

Overview

Built for shooters who want a compact pistol with a full-size feel, this 9mm model combines a 4.3" barrel, striker-fired action, and an optics-equipped slide for a versatile setup. The installed Romeo-X Compact red dot, fiber optic front sight, and black serrated rear sight support fast sight acquisition, while the LXG laser-stippled grip module and interchangeable backstraps help tailor the fit. A removable flared magwell, ambidextrous controls, and 1913 accessory rail add practical flexibility for range use or defensive carry. It ships with two 21-round magazines and one 17-round magazine, giving it substantial capacity right out of the box.

Why Hunters Choose the Sig Sauer

Romeo-x Compact

Red dot installed for ready-to-use

Includes Two

21-round magazines and one 17-round

Lxg Laser-stippled

Grip module with interchangeable backstraps

Fiber Optic

Front and black serrated rear

Ambidextrous Controls

Optics-ready slide with aggressive serrations

Key Features

  • Striker-fired 9mm pistol with a compact frame and full-size performance focus.
  • Includes an installed Romeo-X Compact red dot for immediate optic use.
  • 4.3" carbon steel DLC barrel and stainless steel slide with Nitron finish.
  • Fiber optic front sight paired with a black serrated rear sight.
  • Comes with two 21-round magazines and one 17-round magazine.
  • Features LXG laser-stippled grip, interchangeable backstraps, and ambidextrous controls.

Best Used For

  • Hunters wanting a compact 9mm pistol with higher-capacity magazines included.
  • Users who prefer an optics-equipped carry or range pistol with ambidextrous controls.
  • Shooters needing adjustable grip fit with interchangeable backstraps and a flared magwell.
  • Those looking for a compact platform with full-size handling features for practice sessions.

Specifications

Accessory Rail1913 accessory rail
ActionStriker-fired
BackstrapsInterchangeable small, medium, and large backstraps
Barrel FinishDLC
Barrel Length4.3"
Barrel MaterialCarbon steel
Caliber9mm Luger
ControlsAmbidextrous controls
FrameCompact frame
Grip ModuleLXG laser-stippled grip module
Magazine Capacity21+1
Magazines Included(2) 21-round and (1) 17-round steel magazines
MagwellRemovable flared magwell
OpticRomeo-X Compact red dot
Optics ReadyYes
SerrationsAggressive serrations
SightsFiber optic front / black serrated rear sights
Slide FinishNitron
Slide MaterialStainless steel
TriggerNickel-plated flat-faced trigger
Weight24.8 oz

Pros

  • Romeo-X Compact red dot installed for ready-to-use optics setup
  • Includes two 21-round magazines and one 17-round magazine
  • LXG laser-stippled grip module with interchangeable backstraps
  • Fiber optic front and black serrated rear sights included
  • Ambidextrous controls and optics-ready slide with aggressive serrations
  • Removable flared magwell and 1913 accessory rail

Considerations & Trade-offs

  • The included Romeo-X Compact red dot and fiber optic sights add capability, but they also make this a more specialized setup than a plain iron-sight pistol.
  • The package includes two 21-round magazines and one 17-round magazine, which is useful for capacity, though the larger magazines may be less convenient for carry or storage.
  • At 24.8 oz, it is not a lightweight option, so buyers should expect a bit more bulk than ultra-compact carry pistols.
  • The removable flared magwell and interchangeable backstraps add flexibility, but they also make fit and setup more dependent on the user’s preference.

Suggested Comparisons

  • Compact semi-auto pistols
  • Optics-ready handguns
  • High-capacity 9mm pistols
  • Range and training pistols

Suggested Accessories

  • Red dot optic mounting accessories
  • Pistol cleaning kit
  • Magazine pouch
  • Weapon light

Frequently Asked Questions

What comes included with the P365-FUSE Romeo-X package?

The package includes the pistol with a Romeo-X Compact red dot installed, fiber optic front and black serrated rear sights, two 21-round steel magazines, and one 17-round steel magazine.

Is the P365-FUSE optics-ready?

Yes. The long description states it has an optics-ready slide and also includes a Romeo-X Compact red dot installed.

What size barrel does this pistol have?

The listed barrel is 4.3 inches. The source also identifies it as a carbon steel DLC barrel.

What grip and backstrap options are listed?

It comes with an LXG laser-stippled grip module and interchangeable small, medium, and large backstraps.

What controls and accessory features are listed on this model?

The source lists ambidextrous controls, a removable flared magwell, and a 1913 accessory rail.