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First Look & Overview

In this table top review, taking a detailed look at the Sig Sauer P320 Spectre Comp CO2 Blowback Pellet Pistol, a modern, competition-style airgun replica that closely mirrors its real steel counterpart. This model stands out with its aggressive styling, compensated muzzle, and optics-ready slide, making it one of the more premium-looking pellet pistols currently available.

This is a pellet-only airgun with blowback action, designed more for realism and handling than raw velocity. If already familiar with the Sig Sauer M17 pellet pistol, this one shares a lot of mechanical similarities, including the magazine system.

Specifications

• Caliber: .177 Pellet

• Action: Semi-auto, blowback

• Magazine: 20-round belt-fed rotary system

• Power Source: 12g CO2 (tool-free cam lever system)

• FPS: Claimed 340 FPS

• Weight: ~2.3 lbs

• Overall Length: 8.5 inches

• Barrel Length: 4.6 inches (rifled)

• Construction: Metal slide, polymer frame

• Sights: Fixed white dot front and rear

• Optics Ready: Yes (SIG Air RMR compatible)

• Rail: Picatinny accessory rail

• Safety: Ambidextrous manual safety

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Build Quality & Design

The Sig Sauer P320 Spectre Comp CO2 Blowback Pellet Pistol delivers a solid mix of metal and polymer construction. The metal slide gives it realistic weight and feel, while the polymer frame helps keep things balanced. At around 2.3 pounds, it has a substantial presence in hand without feeling overly heavy.

The grip features enhanced texturing along with a flared magwell, adding to both aesthetics and usability. The slide includes light porting and is optics-ready, allowing for easy installation of a SIG Air RMR red dot.

One standout visual element is the compensated muzzle, which adds to the competition-style look. However, it also impacts field stripping, you’ll need to remove it to fully disassemble the slide.

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Magazine & CO2 System

This pistol uses a 20-round belt-fed rotary magazine, which is housed within a drop-out mag body. Loading is straightforward:

• Remove the rotary belt insert

• Load pellets into each chamber

• Reinsert into the mag

CO2 is loaded using a tool-free cam lever system, which is fast and convenient compared to traditional screw-in designs.

Important note: the magazine needs to be firmly seated. A light insertion may not lock it properly, and due to the weight, it could fall out if not fully engaged.

Also worth noting, while the outer mag housing has some polymer components, the internal structure is mostly metal. Still, avoid dropping it on hard surfaces.

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Handling & Controls

• Ambidextrous safety works from both sides, though visual indicators are only clearly marked on one side

• Trigger feels closer to double-action due to the rotary magazine indexing

• Slide cycles with blowback but does not lock back when empty

• Takedown lever is present, but full disassembly is limited by the compensator

The trigger has a solid feel and requires deliberate pull due to the indexing mechanism. This is normal for belt-fed pellet systems.

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Sights & Optics

The pistol comes with fixed white dot sights, which are effective for quick target acquisition. However, they are not adjustable.

For those wanting more precision, the pistol supports SIG Air RMR optics, replacing the rear sight with an included plate.

Performance Expectations

The claimed velocity is 340 FPS, which is typical for blowback pellet pistols. Expect slightly lower speeds with lead pellets (recommended) compared to alloy pellets.

Blowback operation will also consume more CO2 than non-blowback models, trading efficiency for realism.

If looking for a performance reference, similar results can be expected to the Sig Sauer M17 pellet pistol due to shared internals.

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Pros

• Excellent replica accuracy of the P320 Spectre Comp

• Realistic blowback with metal slide

• Good weight and balance (~2.3 lbs)

• 20-round high-capacity pellet magazine

• Tool-free CO2 cam lever system

• Rifled barrel optimized for pellet shooting

• Optics-ready (SIG Air RMR compatible)

• Flared magwell and enhanced grip texture

• Picatinny rail for accessories

• Magazine compatibility with M17

Cons

• Lower FPS compared to non-blowback pellet pistols

• Higher CO2 consumption due to blowback

• Fixed (non-adjustable) sights

• Pellet-only (no BB capability, though this protects rifling)

• Slide does not lock back when empty

• Field stripping requires compensator removal

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Final Thoughts

The Sig Sauer P320 Spectre Comp pellet pistol is a strong option for anyone prioritizing realism, handling, and modern styling over raw power. It delivers a premium look with solid functionality, especially for training, backyard shooting, or collectors wanting a high-end replica.

While not the most powerful pellet pistol available, it excels in design, usability, and realism, especially if already a fan of the P320 platform.

For those in Canada, availability may already be live, with US availability likely to follow.

• Buy the Sig Sauer P320 Spectre Comp CO2 Blowback Pellet Pistol in Canada

• Buy Sig Sauer Airguns in the US

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The Sig Sauer ASP P320 CO2 Blowback .177 Caliber Pellet Pistol is a really nice evolution to the already existing line of Sig Sauer ASP Pellet Pistols. The 30 round belt fed pellet magazine is what really sets it apart from the Sig ASP P250 and Sig ASP P226 which both share the traditional double sided 8 round rotary pellet magazines found in other CO2 pellet pistols like the Umarex PX4 and ASG CZ P-09 Duty.

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The big question I had was how is the trigger going to feel and is a 30 round belt magazine going to be reliable? Will other aspects of the Sig Sauer ASP P320 CO2 Blowback .177 Caliber Pellet Pistol function and perform like its rotary magazine brothers?

So I figured I would put the Sig Sauer ASP P320 CO2 Blowback .177 Caliber Pellet Pistol up against both the Sig ASP P250 and P226 and see how they all faired against each other.

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During my Chronograph feet per second shooting test I compared all three blowback pellet pistols shooting five rounds from each of them using a brand new CO2 and Sig Sauer 5.25 grain Match Ballistic Alloy Pellets. It was a close race with the Sig ASP P250 averaging 413 fps, the Sig ASP P226 just under with a 409 fps average and the Sig ASP P320 coming in a very close third at 405 fps. Only about 8 fps separating all of them!

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Moving on to the target portion of my testing. As per my standard Field Test Shooting Reviews I setup my paper targets about 30 feet from my rested shooting position and since the ASP P250 and P226 both have 8 rounds per side rotary magazines I decided to shoot an 8 round grouping with all three Sig ASP pellet pistols. It was really close and perhaps one could say most of the variability was because of the human factor. All three CO2 Blowback Pellet Pistols shot about 2 inch groupings with perhaps one or two outliers, again most likely my fault :) I would say the Sig Sauer ASP P250 was perhaps the most accurate with the tightest of the three groups and also the most centered. The Sig Sauer ASP P226 and Sig Sauer ASP P320 where both a close second with both of them shooting just a tad left on target but pretty close to the center.

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What about that Sig Sauer ASP P320 CO2 Blowback .177 Caliber Pellet Pistol trigger and belt fed magazine? The trigger actually felt great, much lighter than I was expecting and I did not have one pellet feed error during my entire testing. At the end of the day all three Sig ASP pellet guns performed about the same, but I have to say having 30 rounds at your disposal without having to reload or rotate the stick mag really makes the Sig ASP P320 stand out and perhaps make it the winner in a very close contest.