The Century Arms SiberGun G1 is a 12 GA semi-automatic shotgun built for field use and competitive shooting. The gas-operated action cycles fast without requiring manual chambering between shots, which matters when you're on moving targets. 
 

Key Specifications 

• UPC: 787450699014 
• Gauge: 12 GA 
• Action: SEMI AUTOMATIC 
• Capacity: 4 ROUNDS 
• Barrel Length: 28 INCHES 
• Weight: 7.25 LBS. 
• Finish: BLACK SYNTHETIC STOCK 
   

Features 

 
The 28-inch barrel gives better sight radius and steadier swing on clay targets or birds. At 7.25 lbs. the gun carries reasonably well over a full day without being heavy enough to feel clunky. 
 
The black synthetic stock handles rain and temperature swings better than wood, and grip stays consistent whether your hands are dry or wet. 
 
Four-round capacity is standard for a hunting configuration. The semi-auto action keeps follow-up shots fast without any extra movement from the shooter.

Century Arms SiberGun G1 owners tend to land in a few predictable camps.

Affordability comes up constantly. For a semi-auto 12-gauge, the price is genuinely low, and budget-minded buyers appreciate that.

Performance reviews are mostly positive. Owners report smooth cycling and few jams across common field loads, which is the baseline ask for any defensive or hunting shotgun.

Build quality gets more varied feedback. Some owners feel it holds up well; others think certain components feel cheaper than comparable guns at the same price point from established brands.

Recoil is manageable for most users. New shooters and experienced ones alike find the 12-gauge impulse reasonable, though it's still a full-size 12-gauge.

Customer service experiences with Century Arms range from straightforward to frustrating, depending on who you reach and what the issue is.

Overall, most owners find it a workable, affordable semi-auto for hunting or sport use, with the usual caveats about mid-range build tolerances.