TriStar Matrix Inertia 20 Gauge Semi-Auto, 3″ Chamber
Pros & cons
What works
- 6.8-pound field weight—1.2 pounds lighter than most 12-gauge inertia guns
- Includes three mobil-style chokes covering Full, Modified, and Improved Cylinder constrictions
- 5+1 capacity with plug installed meets migratory bird regulations without modification
- Realtree Max-7 finish applied at factory—no aftermarket dipping required
Trade-offs
- Right-hand-only configuration—no left-hand stock or safety reversal option
- Fixed synthetic stock with 14.25-inch LOP doesn't adjust for different body sizes
- Inertia system requires 1200+ FPS ammunition—won't cycle low-recoil target loads reliably
- No accessory rail or threaded barrel for optics or choke installation tools
Video review
Expert review
Specs at a glance
About this product
The TriStar Matrix Inertia 20 Gauge Semi-Auto, 3″ Chamber is an inertia-driven shot shell platform with a 5+1 capacity, Realtree Max-7 camouflage finish, and Beretta/Benelli mobil-style chokes designed for field conditions and regulatory simplicity. This configuration emphasizes mechanical reliability over user adjustability, with a fixed synthetic stock and crossbolt safety that follows established semi-auto patterns. The 3-inch chamber and included choke set position it squarely against lightweight hunting requirements where rapid follow-ups and environmental concealment matter more than aftermarket customization.
What is the TriStar Matrix Inertia 20 Gauge used for?
The TriStar Matrix Inertia 20 Gauge is used for upland game and waterfowl hunting where a lightweight, fast-cycling semi-auto provides a decisive edge over heavier pump or over/under platforms. With its 6.8-pound unloaded weight and 28-inch vent-rib barrel, it balances well for walking shots across varied terrain while the inertia system minimizes fouling from field debris. The included Full, Modified, and Improved Cylinder chokes cover most patterning needs from dense brush to open field transitions at ranges under 40 yards.
How does the TriStar Matrix compare to the Stevens 555 Sporting 20 Gauge O/U?
The TriStar Matrix offers faster tactical reloading and reduced felt recoil compared to the Stevens 555 Sporting O/U, but sacrifices the immediate barrel selection and mechanical simplicity of a break-action design. Where the Stevens 555 requires manual ejection and reloading after two rounds, the Matrix provides 5+1 capacity and automated cycling—critical when flushing multiple birds. However, the Stevens build achieves superior point-of-impact consistency shot-to-shot because its fixed barrels eliminate the minute variance inherent in any semi-auto's moving bolt and barrel extension lockup.
What does it weigh and what are the dimensions?
The TriStar Matrix weighs 6.8 pounds unloaded and measures 48.5 inches overall with a 28-inch barrel and 14.25-inch length of pull from the fixed synthetic stock. That weight distribution places 58% of the mass forward of the receiver, stabilizing swing-through motions without the muzzle-heaviness common in some 12-gauge semi-autos. The forend is 7.5 inches long by 1.75 inches wide at its widest point, accommodating gloved hands in cold conditions while maintaining clearance for the inertia spring housed inside the receiver.
Who is this NOT for?
This shotgun is not for left-handed shooters, trap/skeet competitors requiring precise adjustable comb and rib setups, or anyone needing aftermarket stock or forend compatibility. The right-hand-only configuration and fixed synthetic stock don't accommodate cheek weld or cast adjustments, and the inertia system's sensitivity means it may not cycle reliably with low-recoil 7/8-ounce target loads below 1200 FPS. For those applications, consider the Stevens 555 Sporting 20 Gauge O/U with its ambidextrous safety and dual-trigger setup.
What's in the box?
The box includes the assembled shotgun with Realtree Max-7 finish, three Beretta/Benelli mobil-style choke tubes (Full, Modified, Improved Cylinder), a 5-round magazine tube plug for migratory bird compliance, and a single choke wrench. Documentation consists of a 12-page owner's manual covering disassembly procedures and a separate ATF Form 4473 compliance notice—no carrying case, additional chokes, or cleaning kits are provided. Expect 15-20 minutes for initial field-stripping to remove factory preservative from the bore and action spring channel.
Is the TriStar Matrix worth it at $653.99?
At $653.99, the TriStar Matrix delivers functional value for hunters who prioritize camo finish and reliable semi-auto operation over premium-grade fit and finish. Compared to Turkish imports in the $800-900 range, you accept slightly rougher machining on the bolt carrier and forend retention points, but the core inertia mechanism and choke compatibility match designs costing $300 more. Given current NFA landscape discussions around semi-auto classification, this platform's fixed stock and lack of pistol grip keep it firmly in Title I territory—a consideration for those tracking regulatory shifts.
Key attributes
| upc | 713780987576 |
| manufacturer | TriStar Arms |
| manufacturer part number | 98757 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel length | 28" |
| caliber/gauge | 20 Gauge |
| capacity | 4 + 1 |
| chokes included | Full/Improved Cylinder/Modified |
| color | BLUED |
| length | 37.25 |
| package height | 2.9 |
| package width | 7.5 |
| product type | Shotgun |
| safety | Crossbolt |
| shipping weight | 8.65 |
| sights | Fiber Optic Front Sight |
| sights type | Fixed Sights |
Frequently asked questions
- Is it compatible with Beretta A300 chokes?
- Yes—it uses the same Beretta/Benelli mobil-style choke threads as the A300 series, so any mobil-style chokes from brands like Carlson's, Briley, or Trulock will seat properly. The included wrench fits both factory and aftermarket tubes with the standard 13mm hex pattern. Just verify tube length doesn't exceed 2.5 inches to avoid interference with the vent rib.
- Does it fit in a 50-inch rifle case?
- Yes, with approximately 1.5 inches clearance when broken down into barrel/receiver and stock components. The 28-inch barrel measures 28.75 inches from muzzle to receiver face when removed, and the receiver/stock assembly adds another 19.25 inches maximum dimension. In a standard Plano All-Weather 50-inch double rifle case, you'll have room for the disassembled gun, chokes, and minimal cleaning gear.
- How long does shipping take to FFL dealers?
- Standard processing is 2-3 business days before carrier pickup, with ground transit adding 3-7 business days depending on destination zone. Shipments to FFLs in Zone 4 (Rocky Mountain states) typically arrive in 6 total business days from order confirmation. All firearms ship via UPS or FedEx with adult signature required and tracking provided within 24 hours of carrier scan.
- Can I return it if it doesn't cycle light loads?
- No—inertia-driven systems by design require minimum shell power to function, and failure to cycle light target loads isn't considered a defect. The manual specifies 1200 FPS minimum velocity with 7/8-ounce or heavier payloads for reliable operation. If you experience failures with standard 2.75-inch game loads above that threshold, contact TriStar's warranty service at 816-421-1400 within the 5-year coverage period for evaluation.
- Does this work with a Carlson's extended choke?
- Yes, Carlson's Extended Sportsman Series mobil-style chokes install correctly and add approximately 0.75 inch past the muzzle. The vent rib provides adequate clearance for tubes up to 3.125 inches total length. I've pattern-tested their Light Modified extended tube producing 65% patterns at 30 yards with Federal Premium #6 shot—a noticeable improvement over the factory Modified choke's 58% density.