Star Arms SA-320 [Rewiew]

Modern handgun designs continuously appear on the market — from smaller manufacturers to industry giants like SIG Sauer with their M17 and M18 pistols from the P320 family, adopted as the official sidearms of the US Army. Civilians can also enjoy a wide variety of P320 models, each offering diverse features and capabilities.

While airsoft is typically dominated by replicas of Glock, Hi-Capa, or other less common platforms, Vega Force Company has decided to take up the challenge by launching a line of replicas based on SIG Sauer products.

The SIG Sauer P320 platform is a relatively new design, introduced in 2014, and evolved from the P250 series. Instead of a hammer-fired mechanism, it adopted a striker-fired system, along with several innovations. One standout feature is its modular construction, allowing for optics mounting and easy removal of the entire fire control unit for maintenance or replacement. Improved ergonomics, accuracy, and reliability led the U.S. Army to choose the SIG Sauer M17 and M18 — derived from the P320 family — as the successor to the Beretta M9 in 2017. Since then, the P320 series has seen many new variants — and some controversies. So how does the airsoft replica based on the P320 performs?

Box and Contents

Right out of the box, the presentation is impressive. The triangular box holding the replica features a metallic finish resembling polished steel. On the box, you’ll find only the Stark Arms logo, model designation, power source information, and confirmation that it's manufactured by Vega Force Company.

We first encountered the Stark Arms SA320 replicas at the MOA 2024 trade show. From the first glance, it was clear that the grip was inspired by the Wilson Combat design. For this review, we received two versions: the more classic SA320 and the tactical SA320T variant. The key differences include a threaded outer barrel, different grip color, and an extended magazine for the SA320T.

The replicas are a compromise between several models and are not exact copies of any specific P320 version. The grip is clearly modeled after the Wilson Combat WCP P320, but the slide length resembles the Compact variant — albeit slightly longer. Is this a bad thing? Not necessarily, though it may bother purists and affect holster compatibility.

Inside the box, you'll find the replica itself, a magazine, a manual, and a set of three optic mounting plates of various standards.

The replica comes lightly lubricated out of the box, with small amounts of grease visible in key areas. The grip is very well made — on par with the real firearm. While the molding line is visible, it’s perfectly aligned and the seam is undetectable to the touch. Upon closer inspection, you’ll find Stark Arms branding and a Made in Taiwan marking in spots where you would expect Wilson Combat logos on the real gun. The texture of the grip is aggressive and bites slightly into the palm, suggesting a secure grip in all conditions. Additionally, the area around the trigger is slightly indented on both sides for improved ergonomics.

At the front of the grip, there is a Picatinny accessory rail with four slots for mounting add-ons.

The replica features a straightforward trigger with two adjustment screws (for travel and pull weight), allowing users to fine-tune the trigger feel. On the right side of the replica, you’ll find a unique serial number (individual for each replica), etched on the frame of the fire control unit and visible through a cutout in the grip.

The slide stop has a triangular profile with vertical serrations. Left-handed users will appreciate that it can be swapped to the other side. The magazines also have notches on both sides for ambidextrous compatibility.

Another user-friendly feature is the ambidextrous slide release lever, made of steel.
A key component is also the takedown lever on the left side of the frame. Rotating it 90 degrees allows for slide removal and easy access to the fire control unit.

The slide design is fairly traditional, with front and rear serrations and no additional cutouts. It's made from aluminum alloy and features a protective finish on both the inside and outside, showing strong resistance to wear and scratches. The texture is slightly matte and non-reflective.

The slide also includes standard-height iron sights: a plain black rear notch mounted on a plate and a front post with a green dot on a white background for contrast. The sight picture is very clear, and for a moment we were fooled into thinking they were tritium sights.

The slide is also pre-cut for mounting optics, with a blanking plate installed by default. Users can replace this with one of three included mounting plates. Each plate also offers a rear sight mount.

The slide features a polymer mock-up of a striker plate. It’s worth noting that the rear of the replica visibly differs from the original firearm, just like with the licensed M17 Sig Air replica. Internal parts of the fire control unit are visible, and the gap between the slide and frame is fairly large, which could cause issues in dirty environments.

The replica performs reliably right out of the box. The slide operates with light resistance and exhibits minimal side-to-side play. The trigger feel is very satisfying, and the hop-up adjustment is smooth and precise thanks to the Guide Hop system.

Internal Components

The replica is disassembled by locking the slide to the rear, rotating the takedown lever, and smoothly sliding the upper assembly off the grip. Immediately, several convenient design features become apparent.

Starting with the hop-up adjustment, which is done via the recoil spring guide rod, using the proprietary Guide Hop system. The motion is transferred to an adjustment wheel mounted on the chamber. The wheel itself is made of metal — not magnetic — but feels robust and trustworthy due to its thickness and quality.

The hop-up chamber is a two-part design and is fixed in place inside the outer barrel using a pin. Once the pin is removed, the inner barrel and hop-up chamber can be extracted. The outer barrel itself features realistic 9mm x 19 caliber markings on the chamber, just like the real firearm.

Vega Force Company has also considered the needs of more demanding players by implementing a fixed barrel system that locks the chamber in place inside the grip. Unfortunately, straight out of the box this isn’t a perfectly tight fit, but with minor modifications the desired rigidity can be achieved.

The nozzle assembly can be removed after unscrewing two screws inside the slide, which also secure the optic plates. The nozzle has a fairly unique shape, already known from another SIG pistol replica — the SIG M17 (SIG AIR PROFORCE M17). The nozzle housing is made from a single piece of metal with an embedded screw that serves as the mount for the valve head. The head itself is made from relatively hard rubber, but combined with the nozzle it seals very well. The entire unit is identical to the one used in the SIG Air M17 replica.

More changes are found in the lower part of the replica. Aside from an interesting grip design, removing the fire control unit reveals slots for additional weights — just like in the real Wilson Combat grip module, which offers optional weights for balance tuning.

There is no manual safety, and the ambidextrous slide release has no protective barriers. The magazine release button is identical to the one used in the SIG Air M17. To switch sides, you need to push out the polymer locking pin from the rear, disassemble the mechanism, and reassemble it on the opposite side.

Once the takedown lever is removed, you can extract the entire fire control unit — just like in the real firearm. The fire control unit's housing is made from thick cast metal with a matte finish. You’ll also find a mounting point here for the outer barrel lock.

The mechanism includes several steel components such as pins, hammers, the slide catch lever, springs, and the valve hammer. Other elements, like the trigger and trigger bar, are made of different metals. The focus on using steel for key components is clearly visible.

The trigger mechanism includes two screws for adjusting travel and reset. Interestingly, the whole unit is not rigidly assembled and can be easily disassembled using a light magnet. This should be kept in mind when taking it apart to ensure all parts stay in place. The manufacturer has also added a bearing on the hammer for improved reliability, which is a very smart move.

Depending on the version, the replica comes with either a standard magazine or an extended one in the Tactical variant. The magazines feature valves located on the rear side rather than the base plate. These are flush-mounted and do not protrude beyond the magazine’s outline.

The top seal has a flat profile and is made from fairly hard rubber. The magazine also includes 9mm caliber markings. The standard version can hold 22 BBs, while the extended magazine accommodates 26 BBs and has additional gas capacity thanks to an extra module.

The only complaint about the magazines is a slight issue with insertion. The factory slide stop button is a bit too large or poorly shaped, causing noticeable scratching on the magazine and requiring more force than usual to insert. It’s not as smooth as with other designs and may be misleading. The follower is recessed quite deeply, making loading a bit more difficult.

Performance

The manufacturer claims the replica generates a muzzle velocity of 90 m/s, or approximately 290–300 fps. Out of the box, using 0.2g BBs, standard green gas, and at an ambient temperature of 18–20°C, we recorded the following results:

287.1 FPS

282.9 FPS

279.3 FPS

278.3 FPS

276.8 FPS

273.1 FPS

267.3 FPS

264.7 FPS

263.1 FPS

259.1 FPS

Average result: 273.3 FPS

Gas efficiency is quite standard, allowing for 2 to 3 full magazines per gas fill. This applies to both the standard and extended magazines due to the increased gas reservoir. In the accuracy test, the replica performed as follows:

Summary

The Stark Arms SA320 and Stark Arms SA320T (Tactical) replicas mark the beginning of a series of airsoft pistols inspired by SIG Sauer designs. The design by Vega Force Company offers many player-friendly features: the Guide Hop system with recoil spring guide-based adjustment, optic and muzzle device mounting options in the Tactical version, and left-handed user accommodations. At the same time, Vega Force Company maintains its signature high-quality workmanship and attention to detail. Despite a few minor drawbacks, the replica delivers a level of quality comparable to real firearms. Those seeking an alternative to the most popular airsoft sidearms should definitely consider the Stark Arms replicas as a well-designed, reliable, and noteworthy option.