The TriStar Matrix Inertia is a 20-gauge semi-automatic shotgun with a 26-inch barrel, 3-inch chamber, brown walnut stock, and inertia-driven action. It holds 5+1 rounds and measures 49 inches overall. The crossbolt safety is standard. Interchangeable chokes (Full, Modified, Improved Cylinder) are included. 
 

Key Specifications 

• Brand: TriStar 
• Model Name: Matrix Inertia 
• Caliber: 20 GA 
• Action: Semi-Auto 
• Capacity: 5+1 rounds 
• Barrel Length: 26 inches 
• Overall Length (OAL): 49 inches 
• Chamber Size: 3 inches 
• Weight: Approximately 6.7 lbs 
• Grip Type: Standard 
• Trigger Type: Standard 
• Safety Mechanism: Crossbolt 
• Finish Color: Brown Walnut 
   

Detailed Features 

The inertia system uses recoil energy to cycle the action without gas ports or pistons, keeping the mechanism cleaner over extended use. Three choke tubes cover the range from open patterns for close-flushed upland birds to tighter patterns for longer shots. 
 
At 26 inches, the barrel is a practical length for upland hunting, maneuverable in cover while still providing enough sight radius for accurate lead on flushing birds. The walnut stock provides a traditional look and holds up to field conditions.

The TriStar Matrix Inertia 20 GA walnut version draws generally positive feedback, particularly from upland hunters who want a traditional-looking semi-auto at a reasonable price. The walnut stock finish gets consistent positive remarks for aesthetics.

Reliability is rated as solid for most 20-gauge loads, with the typical inertia gun caveat about lighter loads potentially not cycling during break-in. The 6.7-lb weight is manageable for full-day hunts.

Some owners note the ergonomics don't quite match higher-priced semi-autos, and the break-in period for reliable cycling with all load types is the most common practical note. Overall the consensus is favorable as a value-oriented 20-gauge semi-auto.