The Centurion Optio-I is a 12-gauge semi-automatic shotgun built around a detachable magazine system — a real departure from the tube-fed designs most people are used to. Imported by Century Arms, it chambers both 2-3/4" and 3" shells and ships with one 5-round magazine. 
 

Key Specifications: 

• Manufacturer: Centurion (Imported by Century Arms) 
• Model: Optio-I 
• Gauge: 12 Gauge 
• Barrel Length: 20" 
• Finish: Black 
• Capacity: 5 Rounds (Detachable Magazine) 
• Chamber: 2-3/4" & 3" 
• MPN: SG4979-N 
• UPC: 787450772878 
• Included Accessories: 
  • (1) 5-Round Magazine 
  • Owner's Manual 
     

Features: 

The semi-automatic action cycles rounds without manually working the bolt, and the detachable magazine means reloads are faster than swapping shells into a tube. The 20" barrel keeps the gun short enough for tighter spaces. It handles a range of loads — birdshot, buckshot, slugs — wherever the chamber compatibility allows. 
 

Use Cases: 

It works for home defense, hunting, or range time. The detachable mag is most useful in a home-defense or tactical context where speed reloading matters. For hunting upland birds or waterfowl, the 2-3/4" and 3" shell compatibility covers most common loads. Casual range shooters will find the semi-auto action easy to run.

Owners of the Century Arms Optio-1 generally land in one of two camps: people happy with what they got for the price, and people who expected more than an entry-level import delivers.

On the positive side, the price is the most common compliment — it's one of the cheaper semi-auto 12-gauges available, and for buyers who just want a functional shotgun without spending serious money, that resonates. Reliability with standard 2-3/4" loads gets decent marks once the gun is broken in. The lightweight build is also appreciated by people who plan to carry it around, whether hunting or in a home-defense role. Most users find the recoil manageable with typical field loads.

The criticisms are consistent. Build quality and fit-and-finish don't hold up against established brands — some owners note loose tolerances or minor cosmetic issues. Aftermarket support is thin; this isn't a platform with a deep ecosystem of parts and accessories. A break-in period seems to be real for many guns: early cycling issues that smooth out after 50–100 rounds are commonly reported. With lighter loads or cheap bulk ammo, reliability drops noticeably for some users. Customer service experiences are mixed — some people report responsive support, others describe slow turnaround or difficulty getting warranty help.

The Optio-1 appeals to budget-conscious buyers who understand the tradeoffs. It's not a competition-grade shotgun, but for the price it does the job it was built for.