$1,229.99
4 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The P320 XTEN is SIG's answer to a question a lot of people have been asking for years: what does a full X-Series P320 look like in 10mm? The answer is a full-size, striker-fired pistol with a 5" carbon steel bull barrel, a completely redesigned grip module, and enough capacity to make a legitimate case as a backcountry sidearm, hunting companion, or home defense pistol for rural settings. This version specifically includes the ROMEO-X SIG-LOC PRO enclosed reflex sight mounted from the factory, which is a big deal on its own.
The SIG-LOC PRO mounting system was purpose-engineered to solve a real problem with pistol-mounted optics: zero retention under heavy recoil. Instead of the traditional top-down mount, the ROMEO-X SIG-LOC PRO mounts from beneath the slide using a five-point contact interface, locking the optic down in a way that conventional footprints simply can't match. The enclosed 7075 aluminum housing keeps the optic sealed against the elements, and MOTAC motion activation means it powers on the moment you pick it up. For a round as punishing as 10mm, this level of optic retention matters.
SIG didn't just drop a 10mm barrel into an existing frame and call it a day. The X grip module on the XTEN was redesigned specifically for the larger 10mm and .45 ACP platform, keeping the grip circumference impressively slim while incorporating a deep trigger undercut, extended beavertail, and aggressive stippling on all four sides. The result is a pistol that gives you a high, locked-in grip that puts recoil energy where you can manage it. Reviewers who've put serious round counts through the XTEN consistently note that it shoots softer than you'd expect from a full-power 10mm load. The flat X-Series trigger with its crisp 90-degree break is the same setup found across the X-Series lineup, so if you've shot an XFive or X-Carry, you already know what you're getting.
The stainless steel slide wears a Nitron finish and comes pre-cut for a Romeo2 and Trijicon RMR footprint in addition to the SIG-LOC PRO mounting already in place. XRAY3 day/night sights are included as a backup, and the M1913 Picatinny rail up front gives you room to run a weapon light, which is highly recommended for any backcountry or low-light role. Two 15-round steel magazines ship with every pistol. The XTEN tips the scale at 33.7 oz unloaded, which is respectable given what it's packing, and the overall length comes in at 8.5" with a 5.9" height.
The SIG-LOC PRO uses a bottom-mount interface with five points of contact between the slide and optic, rather than the traditional top-down two-screw method. This design was built specifically to withstand the hard-recoiling nature of calibers like 10mm, dramatically reducing the chance of zero shift under repeated firing or impact. The ROMEO-X SIG-LOC PRO optic included with this pistol is purpose-built for this mounting system and features an enclosed, sealed 7075 aluminum housing for durability in field conditions.
It's one of the better polymer-framed options in the 10mm category for exactly that role. The combination of 15+1 capacity, a powerful 10mm chambering, an optic-ready slide, and a Picatinny rail for a weapon light checks a lot of boxes for backcountry use. At 33.7 oz unloaded, it carries well in a chest or OWB holster without being brutal on the trail. Paired with hard-cast heavy-for-caliber 10mm loads, it's a credible option for anyone spending time in predator country.
The XTEN uses the same X-Series full-size frame profile as other P320 X-Series pistols, so many X-Series holsters will work, particularly those that accommodate a light on the rail. However, the XTEN grip module is only compatible with 10mm and .45 ACP parts and magazines. Standard 9mm, .357 SIG, and .40 S&W P320 components are not compatible with this platform, so keep that in mind if you're already deep in the P320 ecosystem.
Yes. The ROMEO-X SIG-LOC PRO features a low deck height specifically designed to allow absolute co-witness with standard-height iron sights, including the XRAY3 sights installed on the XTEN. This means you can use both the red dot and the irons simultaneously at the same point of aim, which is a practical advantage in low-light or high-stress situations where the red dot might get obstructed.
Surprisingly well, given its polymer construction. The redesigned X grip module keeps the grip slim while incorporating a deep undercut trigger guard, extended beavertail, and full stippling, all of which contribute to a higher, more secure hand position that naturally manages muzzle rise. Multiple independent reviewers who ran the XTEN with 180-grain full-power loads described the recoil as more manageable than expected, especially compared to other full-size 10mm pistols. That said, it's still a full-power 10mm, so new shooters should approach it accordingly.
This model is specifically designed for the SIG-LOC PRO footprint, which is exclusively compatible with SIG SAUER ROMEO-X SIG-LOC PRO optics and comes with one factory installed. The slide also retains the standard Romeo2 and Trijicon RMR footprint cut for those who prefer a different optic, though a sealing plate is required when the SIG-LOC system is not in use. Always confirm compatibility before purchasing a third-party optic for this specific slide variant.
| UPC | 798681718542 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 320X5-10-BXR3-RXSL |
| Action | |
| Barrel Length | 5" |
| Caliber/Gauge | 10mm |
| Capacity | 15 |
| Color | Black |
| Model | |
| Product Type | Striker Fired |
| Sights | Night Sights |
You must be logged in to post a review.
Reviews
There are no reviews yet.