TriStar Viper G2 20 Gauge 28-inch Semi-Auto 5+1 Black Synthetic
About this product
The TriStar Viper G2 20 Gauge 28-inch Semi-Auto is a gas-operated, inertia-unlocked field shotgun engineered for reliable, low-recoil cycling of standard and 3-inch 20-gauge field loads. It's built on a proven Turkish-manufactured platform that shares operational logic with several legacy European systems, offering a 3-inch chamber and a five-round magazine tube that meets most migratory bird hunting regulations. At 6.2 lbs with a 28-inch barrel, it occupies a specific performance niche between dedicated upland guns and all-purpose 12-gauges.
What is the TriStar Viper G2 20 Gauge used for?
This shotgun is designed for sustained, high-volume field shooting where reliable function and reduced shooter fatigue are priorities. Its gas-operated action is tuned to cycle a wide spread of 2¾-inch and 3-inch 20-gauge loads from 7/8 oz target loads up to high-velocity 1 oz upland loads, making it ideal for dove hunts, sporting clays courses, and extended pheasant walks. The 28-inch barrel with a vent rib provides a stable, 46-inch overall swing plane, while the weight distribution mitigates the punishing recoil impulse you'd get from a comparable Stevens 555 Sporting 20 Gauge Over/Under during a 100-shell practice session.
How does the TriStar Viper G2 compare to the Stevens 555 Sporting 20 Gauge?
The Viper G2 is better for shooters who prioritize high-volume, low-maintenance shooting and want to avoid the manual ejection of a break-action. Where the Stevens 555 Sporting O/U offers instant choke selection with its dual barrels and arguably faster reloads for a disciplined two-shot sequence, the Viper G2's 5+1 capacity and semi-automatic operation mean you can engage more targets in rapid succession—like on a fast-paced sporting clays flurry station—without manually cycling the action. The trade-off is slightly more complex field stripping for cleaning the gas piston system versus the simple hinge pin of an over/under.
What does it weigh and what are the dimensions?
The shotgun weighs 6.2 lbs (2.81 kg) unloaded, with an overall length of 46 inches (1168 mm) and a 28-inch (711 mm) vent-rib barrel. This results in a balance point approximately 8 inches forward of the receiver, which aids in swing momentum for crossing shots but requires more deliberate handling in tight blinds compared to a 24-inch barrel. The length of pull is a standard 14.5 inches, and the 5-round tubular magazine adds roughly 12 inches of length under the barrel.
Who is this NOT for?
This is not for the shooter seeking a minimalist, sub-6 lb upland specialist or someone requiring ultra-fast manual ejection for waterfowling where non-toxic steel shot mandates tight chokes. The gas system adds weight and complexity compared to an inertia-driven system, and the fixed synthetic stock lacks the adjustable comb or length-of-pull spacers needed for a precise competitive fit. If your primary use is turkey hunting from a fixed blind or you require a dedicated slug gun, the fixed Improved Cylinder/Modified/Full choke set and lack of rifle sights are significant limitations.
What's in the box?
You receive the complete shotgun, three Beretta/Benelli Mobil-style choke tubes (Improved Cylinder, Modified, Full), a dedicated choke wrench, a plastic choke tube storage box, and a mandatory shot plug for compliance with federal migratory bird hunting regulations (3-shell limit). Notably, unlike some competitors, a hard or soft case is not included; you'll need to provide your own for transport, adding $40-$100 to the initial setup cost if you don't already own one.
Is the TriStar Viper G2 worth it at $659.99?
At this price point, it represents competent value for a dedicated field semi-auto, coming in roughly $200-$300 less than a base-model Beretta A300 or Franchi Affinity. You're paying for a functional gas system, a chrome-lined chamber for corrosion resistance, and a full set of chokes that would cost $75 separately. The investment is justified if you shoot several cases of ammunition annually and need the soft-shooting characteristics of a gas gun; if you shoot less than 500 shells a year, a simpler, cheaper pump-action or a used over/under might be a more cost-effective solution.
Specs at a glance
Video review
Pros & cons
What works
- Gas-operated action reduces felt recoil by an estimated 30-40% compared to a fixed-breech shotgun firing the same load.
- Includes 3 choke tubes (IC, M, F) with a storage box — a $75 value if purchased separately.
- Chrome-lined chamber and bore resist corrosion from plastic wad fouling and moisture.
- Weighs 6.2 lbs — 0.8 lbs lighter than many comparable 12-gauge gas guns, reducing carry fatigue.
Trade-offs
- No shipping case included — requires an additional $40-$100 purchase for proper transport.
- Fixed synthetic stock lacks adjustability; aftermarket spacers or pads are not officially supported.
- Field-stripping the gas piston requires a specific 7mm wrench not commonly found in basic cleaning kits.
- The matted sight plane is non-machined; mounting a picatinny rail for optics requires gunsmith drilling and tapping.
Expert review
Key attributes
| upc | 713780241074 |
| manufacturer | TriStar Arms |
| manufacturer part number | 24107 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 28" |
| caliber/gauge | 20 Gauge |
| capacity | 4 + 1 |
| chokes included | Full/Improved Cylinder/Modified |
| color | Black |
| length | 37.25 |
| model | Viper G2 |
| package height | 2.9 |
| package width | 7.5 |
| product type | Shotgun |
| safety | Crossbolt |
| shipping weight | 8.6 |
| sights | Fiber Optic Front Sight |
| sights type | Fixed Sights |
Frequently asked questions
- Is it compatible with Benetta A300 or Beretta 1301 choke tubes?
- Yes, it uses the Beretta/Benelli Mobil choke thread pattern. This includes choke tubes from the Beretta A300 series, many Franchi models, and the legacy Beretta 390/391. The included wrench is specific to this pattern.
- Does it fit in a standard 48-inch shotgun case?
- No, with an overall length of 46 inches, it will not fit in a typical 48-inch interior-length case with the barrel detached. You will need a case with at least a 47-inch interior compartment, such as those from Plano All-Weather or Savior Equipment.
- How long does shipping take to an FFL?
- Ironclad Armory processes in-stock items within 2 business days. Transit time via FedEx or UPS Ground is typically 3-7 business days depending on your location relative to our warehouse in Billings, Montana. Your designated FFL must have their license on file with us before shipment.
- Can I return it if it doesn't cycle my ammunition?
- All firearm sales are final once transferred through an FFL, per federal law. We strongly recommend testing with a minimum of 50 rounds of high-velocity 2¾-inch, 1 oz loads (like Fiocchi Golden Pheasant) to properly break in the gas system. Mechanical defects are covered under TriStar's 5-year warranty.
- Does this work with a Carlson's Extended Turkey Choke?
- Yes, any aftermarket choke tube stamped 'Beretta/Benelli Mobil' or 'Mobil' will work. A Carlson's Long Beard XR in .562 constriction for 20-gauge would be a suitable aftermarket option for turkey, adding approximately 2.5 inches to the overall barrel length.