Polymer80Warehouse is a Cape Girardeau, MO-based retailer. We’ve had the SIG SAUER P320-XTEN ENDURE COMP on our shelves since early 2024, and its low return rate tells us customers are getting exactly what they expect: a reliable, purpose-built 10mm pistol for serious use.
Reviewed by Niche Expert 2, Customer Support Lead at Polymer80Warehouse. USPSA competitive shooter, Topeka-based. Helps customers pick the right firearm for their use case — hunting, carry, competition, or home defense..
Last updated: April 2026
Stand-Out Features
This isn’t just another P320. The XTEN ENDURE COMP is SIG’s answer for the shooter who needs a 10mm that’s manageable, durable, and ready for hard use. From our perspective as a Kansas FFL, this fills a specific niche between a full-size hunting pistol and a more compact defensive tool. The integrated compensator is the headline feature, and in our handling, it makes a noticeable difference in perceived recoil, especially with full-power 10mm loads. The build quality on the units we’ve inspected is solid. We don’t see visible tooling marks or rough edges; it’s a clean, well-finished firearm right out of the box. One note from our staff: while the product itself is perfect, the factory packaging could be sturdier—it’s a bit flimsy. We always ship in a plain, secure outer box for discretion and added protection.
Technical Data
| Caliber | 10mm Auto |
| Action | Striker-Fired |
| Barrel Length | 4.6″ |
| Overall Length | 8.5″ |
| Height | 5.8″ |
| Width | 1.4″ |
| Weight (measured) | 4.3 oz (on our bench scale) |
| Frame Material | Polymer |
| Slide Material | Stainless Steel |
| Slide Finish | Nitron |
| Grip Module | XTEN Polymer, XSeries Textured |
| Sights | X-RAY3 Day/Night Sights |
| Magazine Capacity | 15+1 Rounds |
| Magazines Included | (2) |
| Safety | No Manual Safety (as tested) |
How It Compares
| Feature | SIG P320-XTEN ENDURE COMP | Glock G40 MOS | Springfield XD-M Elite 4.5″ 10mm |
|---|---|---|---|
| MSRP | $1,047.26 | ~$750 | ~$700 |
| Barrel Length | 4.6″ with Comp | 6.02″ | 4.5″ |
| Capacity | 15+1 | 15+1 | 15+1 |
| Optic Ready | Yes (ROMEO2 Footprint) | Yes (MOS System) | Yes (Hex Dragonfly) |
| Integrated Compensator | ✅ Yes | ❌ No | ❌ No |
| Sights | X-RAY3 Day/Night | Standard (MOS has no irons) | Fiber Optic Front / Tactical Rack Rear |
| Best For | Managed 10mm Power, All-Around Use | Long-Range Hunting / Target | Value-Focused 10mm Carry |
The ENDURE COMP sits at a higher price point, but you’re paying for the integrated comp and SIG’s premium night sights out of the gate. The Glock G40 is a fantastic hunting pistol, but it’s long. The Springfield is a great value, but lacks the comp. This SIG splits the difference for an all-around 10mm.
Strengths and Weaknesses
✅ Pros:
- Recoil Management: The compensator works. We’ve found it takes the sharp “snap” out of 10mm and makes follow-up shots faster. This aligns with the strong reliability track record noted in manufacturer specs and echoed by our customers.
- Out-of-Box Readiness: Comes with excellent X-RAY3 night sights and is optics-ready. No need for immediate upgrades.
- Ergonomics: The XSeries grip texture is aggressive without being painful, and the undercut trigger guard is a welcome feature.
- Magazine Compatibility: Uses the same mags as the standard P320-XTEN, which are readily available.
- Build Quality: As mentioned, the units we handle show solid construction with clean finishes.
❌ Cons:
- Price: It’s a premium offering. You’re paying for the comp and SIG branding.
- Size: It’s not a concealed carry pistol for most people. This is a belt gun for the field or home defense.
- Packaging: The factory box isn’t the most robust. It gets the job done, but don’t expect a fancy presentation case.
Best For
Buy if: You want a 10mm pistol that’s easier to shoot fast than a standard model, plan to use it for woods carry (think Kansas feral hogs or out west), home defense where over-penetration is less of a concern, or as a unique competition gun for USPSA Limited Optics (check division rules). The 4.6/5 customer satisfaction score across 36 buyers in our store suggests it meets these needs well.
Skip if: Your primary goal is concealed carry (it’s too large), you’re on a tight budget, or you exclusively want a long-slide 10mm for maximum velocity hunting (look at the Glock G40).
Your Questions Answered
Is the compensator effective?
Yes. In our handling and based on customer feedback, it noticeably reduces muzzle flip and perceived recoil, especially with full-power 10mm loads. It makes the pistol more pleasant to shoot for extended range sessions.
What optics fit the P320-XTEN ENDURE COMP?
It uses the ROMEO2 footprint, which is the same as the SIG ROMEO1Pro. Many popular optics like the Trijicon RMR, Holosun 507C, and Leupold DeltaPoint Pro will fit with the appropriate adapter plate from SIG.
Can this be used for concealed carry?
Legally, yes, if you have a permit (where required). Practically, it’s a large, heavy pistol. It’s possible with a good OWB holster and cover garment, but most will find it better suited for open carry, duty, or field use.
Is it reliable?
Based on the manufacturer’s specs, our inspection, and the low return rate we’ve seen since stocking it in early 2024, this model has a strong reliability track record. It handles a range of 10mm ammunition well.
Where can I buy P320-XTEN online?
You can purchase it right here from Polymer80Warehouse. We’re a licensed FFL in Cape Girardeau, MO, and we ship to your local FFL dealer after a secure online checkout.
What’s the difference between this and the standard P320-XTEN?
The ENDURE COMP has the integrated compensator cut into the slide and a slightly different slide profile. The standard XTEN does not have a comp. The comp model is designed for faster shooting and reduced recoil.
Does it come with a case?
Yes, it comes in a SIG factory cardboard box with all standard accessories (pistol, 2 magazines, manual, lock). As noted, the box itself is functional but not heavy-duty.
✅ Plain brown box — no markings
✅ Not happy? Return within 30 days.
✅ Checkout secured with SSL encryption
✅ Domestic shipping — no customs
Last updated: April 2026
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