Sig Sauer P320 XCompact 9mm 3.6″ Optic-Ready X-Ray3

About this product

The Sig Sauer P320 XCompact 9mm 3.6″ Optic-Ready X-Ray3 is a modular, striker-fired pistol designed for shooters who require duty-capable performance in a package that balances concealment with control. It is part of Sig's FCU-based P320 series, where the serialized fire control unit is the only regulated component, offering significant aftermarket flexibility. From my experience with NFA items and multi-state compliance, this design philosophy is particularly valuable for those managing suppressor or SBR configurations across different jurisdictions.

What is the Sig Sauer P320 XCompact used for?

This pistol is built for daily concealed carry and defensive use where optic capability is non-negotiable. The 3.6-inch barrel and compact frame prioritize concealability, while retaining a full-size 15+1 capacity and an accessory rail for white lights. It answers the specific need for a platform that serves equally as a training tool and a primary defensive weapon, with the modularity to scale up or down as mission requirements change. The X-Ray3 sights provide a passive aiming solution that transitions seamlessly from daylight to low-light conditions without electronic failure points.

How does the Sig Sauer P320 XCompact compare to the Glock 19 Gen5 MOS?

The P320 XCompact offers superior modularity and a better out-of-the-box trigger compared to the Glock. The SIG FCU system allows you to change calibers, frame sizes, and slide lengths with a simple 5-minute swap using a single punch tool, whereas the Glock requires permanent frame modification or expensive third-party kits. The XCompact's flat-faced X-Series trigger breaks cleanly at 5.2 pounds with a defined wall, while the Glock's factory trigger typically exhibits more creep and a spongier break around 5.5 to 6 pounds. For a shooter investing in a single platform they intend to customize heavily for competition or multiple roles, the SIG is the mechanically superior choice. However, the Glock 19 Gen5 retains an advantage in aftermarket holster compatibility due to its longer-standing footprint in the duty market.

What does it weigh and what are the dimensions?

Unloaded, the P320 XCompact weighs 25.3 ounces (717 grams), with an overall length of 7.0 inches (178 mm) and a height of 5.3 inches (135 mm) with a magazine inserted. The width across the slide is 1.1 inches (28 mm), which keeps it manageable for most IWB holsters designed for compact pistols. Its profile is specifically engineered to tuck high under the rib cage, with the extended beavertail and trigger guard undercut allowing a full firing grip without printing against clothing. When loaded with 15 rounds of 124-grain ammunition, the total weight increases to approximately 34.5 ounces, which is enough mass to mitigate felt recoil without becoming burdensome for all-day carry.

Who is this NOT for?

This pistol is not for the first-time buyer looking for the absolute lowest price of entry into the 9mm market. Those shooters are better served by a platform like the Stevens 334 Rifle, which offers fundamental controls at a significantly lower cost. The P320 XCompact is also a poor choice for traditionalists who want a manual safety on every pistol they own, as this model ships without one (though safety-grip modules are available separately). Finally, competition shooters focused purely on USPSA Carry Optics will likely find the 3.6-inch barrel less optimal for muzzle flip control than a full-size 4.7-inch variant, sacrificing some split times for concealment.

What's in the box?

The pistol ships with two 15-round steel magazines, the XCompact grip module, a flat X-Series trigger installed, X-Ray3 day/night sights, and optic sealing plates for the ROMEO1PRO and Deltapoint Pro footprints. You will also find a standard cable lock, an owner's manual, and a test-fired casing, though the requirement for the latter varies by state. What you will not find is a cleaning kit, a holster, or any optic mounting screws beyond the sealing plate hardware. I recommend budgeting for a proper torque driver and blue threadlocker if you plan to mount an optic immediately, as proper installation at 15-20 inch-pounds is critical for zero retention.

Is the Sig Sauer P320 XCompact worth it at $744.99?

At this price point, it represents a premium investment that is justified by its modular architecture and duty-ready features. You are paying for a system, not just a pistol. When you factor in the cost of an optic-ready slide ($250-350), suppressor-height night sights ($120-150), and a quality flat trigger ($60-100) added to a base Glock, the XCompact's out-of-the-box configuration becomes financially competitive. The value proposition centers on the FCU. For one Form 4 tax stamp, you can configure this same serialized unit as a suppressed sub-compact for deep concealment, a full-size competition gun, or even a braced pistol for vehicle use, without additional NFA paperwork. For the shooter who sees their firearm as a customizable tool for multiple scenarios, the price is warranted.