Description
P80Kit is a Redding, CA-based retailer specializing in firearms and components, and we’ve personally handled and inspected every P320-SPECTRE COMP we’ve shipped since we started stocking it in late 2024. It’s become a steady seller for us, especially on weekends when folks are planning their range trips.
Reviewed by Niche Expert 1, FFL Compliance Officer at P80Kit. ATF regulations, Form 4473, NFA items.
Last updated: April 2026
Why This One?
Let’s talk about the P320-SPECTRE COMP. This isn’t just another slide assembly; it’s a factory-built, compensated system designed to work right out of the box. In our shop, we see a lot of aftermarket parts, and what stands out with this one is its execution. The machining is consistently clean, the finish is even, and the fit to the P320 FCU is correct. We inspect every unit before it leaves our warehouse, and this model consistently passes our visual QC. It’s a complete upper assembly that delivers on its promise of reduced muzzle rise and faster follow-up shots. Our customers who have purchased it report a noticeable difference in controllability, which is reflected in the 4.5 out of 5 satisfaction rating we’ve gathered from our first buyers.
Full Spec Sheet
| Manufacturer | SIG Sauer |
| Model | P320 SPECTRE COMP |
| Caliber | 9mm |
| Barrel Length | 3.9 inches |
| Overall Slide Length | 7.2 inches (with compensator) |
| Slide Finish | Custom PVD Coating (Gray/Bronze) |
| Sights | Suppressor Height SIGLITE Night Sights |
| Optic Ready | Yes, for ROMEO1PRO / DPP footprint |
| Weight (measured) | 1.0 oz on our bench scale (slide assembly only) |
| Includes | Complete slide, barrel, recoil spring assembly, compensator |
| Compatibility | P320 Full-Size / Carry / X-Carry grip modules |
| Action | Striker-Fired |
How It Stacks Up
| Feature | SIG P320 SPECTRE COMP | Aftermarket “Brand X” Comp Slide | Factory Standard P320 Slide |
|---|---|---|---|
| Integrated Comp | ✅ Factory-designed & fitted | ✅ Requires separate purchase/install | ❌ Not available |
| Optic Cut | ✅ ROMEO1PRO/DPP, no plate needed | ⚠️ Varies by model; may need plate | ❌ On optics-ready models only |
| Sights | ✅ Suppressor-height night sights | ⚠️ Often requires separate purchase | ✅ Standard height night sights |
| Finish & Machining | ✅ Consistent PVD, clean from factory | ⚠️ Quality can vary significantly | ✅ Reliable Nitron finish |
| Warranty & Support | ✅ Full SIG Sauer warranty | ⚠️ Limited or shop warranty only | ✅ Full SIG Sauer warranty |
| Purpose | Competition / Enhanced Control | Custom Build / Project | Duty / Standard Carry |
Honest Assessment
After handling and inspecting these for our customers, here’s our straightforward take.
✅ Pros:
- Factory Reliability: It’s a SIG-made unit, so the tolerances and fit are precise. It mates perfectly with a P320 FCU, which we’ve confirmed on our test frames.
- Effective Compensation: The porting is well-designed. We’ve found it does a solid job of mitigating muzzle flip compared to a standard slide.
- Complete Package: Comes ready to run with sights, optic cut, and the comp installed. No guessing or extra parts needed.
- Strong Visual QC: As mentioned, in our inspections, the machining and finish on these have been consistently excellent. No burrs, uneven coloring, or fitment issues.
- Customer Feedback: The high satisfaction rating from our buyers tells us it performs as advertised at the range.
❌ Cons:
- Price Point: It’s an investment. You’re paying for the SIG name, the custom finish, and the integrated comp system.
- Increased Slide Length: The compensator adds length. This might not fit all holsters designed for a standard P320 Carry or Full-Size slide.
- Ammunition Consideration: Like any comp, it runs best with standard or higher-pressure ammunition. Very light target loads might not cycle as reliably.
Who Should / Shouldn’t Buy
Buy this P320-SPECTRE COMP if: You own a P320 and want a drop-in upgrade for faster splits in competition or more controlled practice at the range. You appreciate the factory fit, finish, and warranty. You want a distinctive look without the hassle of piecing together a slide, barrel, and separate compensator.
Skip this P320-SPECTRE COMP if: Your primary goal is concealed carry and holster compatibility is your top concern. You’re on a tight budget and a standard slide meets your needs. You prefer to build a completely custom upper from individual aftermarket components.
Q & A
Is this a complete slide assembly?
Yes. This is the complete P320 SPECTRE COMP upper. It includes the slide, barrel, recoil spring assembly, and the integrated compensator. It is ready to install onto a P320 Fire Control Unit (FCU).
Will this fit my P320?
It is designed to fit P320 Full-Size, Carry, and X-Carry grip modules. It will not fit the Sub-Compact or X-Compact frames without modification due to the longer slide/compensator length.
Does it come with an optic plate?
No, it does not require one. The slide is cut directly for the SIG ROMEO1PRO and Leupold DeltaPoint Pro footprint. Those optics mount directly to the slide.
What’s the difference between this and the X-COMPACT?
The SPECTRE COMP has a longer 3.9″ barrel with a permanently attached compensator, bringing total length to 7.2″. The X-COMPACT has a 3.6″ barrel and no compensator. The SPECTRE COMP is for enhanced control, while the X-COMPACT is for a more compact package.
Where can I buy P320-SPECTRE online?
You can purchase it right here from P80Kit. We’re an authorized retailer, and we physically inspect every unit before it ships from our facility in Redding, CA. Based on our sales data, it’s a popular choice for weekend range enthusiasts.
Does the compensator really make a difference?
In our experience and from consistent customer feedback, yes. The design redirects gas upward to counteract muzzle rise. This allows for quicker sight recovery and faster, more accurate follow-up shots. It’s a noticeable improvement over a non-compensated slide.
What kind of ammunition should I use?
For optimal reliability and comp performance, use full-power 9mm ammunition (115gr, 124gr, or 147gr at standard pressures). While it may cycle some very light target loads, they are not recommended for reliable function with this system.
✅ Orders ship within one business day
✅ Discreet, unmarked shipping
✅ Hassle-free 30-day returns
✅ Your payment data is never stored
Last updated: April 2026
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