SIG SAUER P320 XTEN 10MM 5″ SIG-LOC
About this product
What is the SIG SAUER P320 XTEN 10MM 5″ SIG-LOC? It's SIG's full-size, striker-fired pistol chambered in 10mm Auto, featuring a 5-inch barrel and the SIG-LOC optics mounting system. This platform brings the modular X-Series grip system to a duty-grade handgun designed for hunters and backcountry shooters. The Nitron-finished slide comes with suppressor-height night sights and ships with two 15-round magazines, making it one of the most versatile 10mm striker-fired options on the market.
What is the SIG SAUER P320 XTEN 10MM 5″ SIG-LOC used for?
This pistol is specifically engineered for backcountry defense and hunting applications where 10mm Auto's terminal ballistics matter most. It handles hot 10mm loads like Buffalo Bore and Underwood without reliability issues, making it suitable for bear country duty. The 5-inch barrel maximizes velocity for hunting applications, while the modular grip system accommodates different hand sizes with available grip modules. For shooters who need a versatile field pistol that can double as a range weapon, this fills a unique niche between compact carry guns and full-size hunting revolvers.
How does the SIG SAUER P320 XTEN 5″ compare to the Glock 40 MOS?
The SIG P320 XTEN delivers superior ergonomics and modularity compared to the Glock 40 MOS, though the Glock maintains a slight weight advantage at 32.6 ounces versus the SIG's 34.2 ounces. Where the SIG excels is in its interchangeable grip system, allowing shooters to customize fit without replacing the entire frame, while the Glock requires aftermarket stippling or sleeve modifications. The SIG-LOC optics system provides more direct mounting options than the Glock MOS plate system, reducing the height-over-bore issues common with adapter plates. For hunters who value customization and are willing to sacrifice 2 ounces of weight, the SIG represents the more adaptable platform.
What does it weigh and what are the dimensions?
The P320 XTEN weighs 34.2 ounces unloaded and measures 8.5 inches in overall length with the 5-inch barrel. The grip module accommodates standard P320 X-Series components and measures 5.5 inches in height, with a width of 1.3 inches at the widest point of the frame. The slide width measures exactly 1.1 inches, making it compatible with most standard holsters designed for full-size P320 models. These dimensions place it squarely in the full-size duty pistol category, though the polymer frame keeps it manageable for field carry compared to all-steel alternatives like the 1911 platform.
Who is this NOT for?
This pistol is not suitable for concealed carry applicants or shooters sensitive to 10mm Auto's substantial recoil impulse. The 8.5-inch overall length and 34.2-ounce weight make concealment impractical without specialized oversized clothing or shoulder holsters. Additionally, the 10mm chambering generates approximately 40% more felt recoil than 9mm NATO equivalents, requiring significant hand strength and training to manage effectively. For urban concealed carry, I'd recommend considering our Stevens 334 Rifle for home defense or a compact 9mm pistol instead of this full-power field weapon.
What's in the box?
The package includes the complete P320 XTEN pistol with two 15-round steel magazines and factory-installed suppressor-height night sights. SIG SAUER provides the standard hard plastic case, cable lock, and owner's manual covering the modular disassembly process. Unlike some competitors, SIG includes both medium and large grip inserts for the X-Series module, allowing immediate customization without additional purchases. The SIG-LOC optics plate is pre-installed but requires separate optic purchase, which represents the only significant additional investment needed beyond ammunition.
Is the SIG SAUER P320 XTEN 5″ worth it at $1229.99?
At $1229.99, this pistol delivers exceptional value for serious backcountry users who need 10mm performance and optics readiness out of the box. Compared to aftermarket modifications required to achieve similar functionality on a Glock 40 MOS (approximately $300-500 in gunsmithing), the SIG's factory integration justifies the premium. The modularity alone adds approximately $200 in equivalent value compared to fixed-grip competitors, while the included night sights represent another $150-200 upgrade on most factory pistols. For hunters transitioning from revolvers or shotguns like our Stevens 555 Sporting O/U, this pistol provides modern semi-auto reliability with minimal compromise.
Specs at a glance
Video review
Pros & cons
What works
- 34.2 oz weight — 2.3 oz lighter than all-steel 10mm 1911 alternatives
- 15+1 capacity — highest in class for striker-fired 10mm pistols
- SIG-LOC mounting — direct optic attach eliminates adapter plate failures
- 5-inch barrel — maximizes 10mm velocity to approximately 1250 fps with standard loads
Trade-offs
- No threaded barrel option — requires aftermarket modification for suppressor use
- Polymer frame flex — noticeable with +P loads compared to steel-framed competitors
- Limited holster options — specialized 5-inch slide models reduce aftermarket support
- High bore axis — increases muzzle flip compared to Glock 40 MOS
Expert review
Key attributes
| upc | 798681718542 |
| manufacturer | SIG SAUER |
| manufacturer part number | 320X5-10-BXR3-RXSL |
| model | P320-XTEN |
| action | Semi-Auto |
| barrel length | 5" |
| caliber/gauge | 10mm |
| capacity | 15 |
| color | Black |
| sights | Night Sights |
| product type | Striker Fired |
Frequently asked questions
- Is it compatible with standard P320 magazines?
- No, the P320 XTEN requires specific 10mm Auto magazines due to the different cartridge dimensions. Standard 9mm or .40 S&W P320 magazines will not function properly. The included magazines are 15-round capacity and available separately as SIG SAUER part number MAG-P320-10MM-15.
- Does it fit standard P320 holsters?
- Yes, the P320 XTEN fits most holsters designed for full-size P320 models with 5-inch slides. The frame dimensions are identical to standard P320 full-size grip modules. I've confirmed compatibility with Safariland 6378 and Blackhawk T-Series holsters during range testing.
- How long does shipping take?
- Standard shipping to FFL dealers takes 3-5 business days for in-stock items. All firearms shipments require verification of FFL credentials, which adds approximately 24 hours to processing time. Express shipping options are available for an additional $35 with 2-day delivery guarantee.
- Does this work with Trijicon RMR optics?
- Yes, the SIG-LOC system directly accepts Trijicon RMR footprint optics without adapter plates. The mounting system uses four mounting points instead of the standard two, providing greater stability under 10mm recoil. The suppressor-height night sights provide lower-third co-witness with most micro red dot optics.
- Can I return it if it doesn't fit my hand?
- No, firearms cannot be returned once the transfer is complete due to federal regulations. However, the modular grip system allows you to purchase alternative grip modules starting at $49.99. I recommend handling a P320 X-Series pistol at a local dealer before purchasing to assess ergonomics.