The EAA Corp MC312 Sport is a semi-automatic 12-gauge shotgun built around an inertia operating system. It has a 24-inch barrel, weighs 6.75 lbs, and holds 5+1 rounds in a 3-inch chamber. It ships with five chokes, a red dot optic, and a fiber optic front sight. 
 

Key Specifications 

• Manufacturer: EAA Corp 
• Model: MC312 Sport 
• Gauge: 12 GA 
• Action: Semi-Automatic 
• Barrel Length: 24 inches 
• Weight: 6.75 lbs. 
• Capacity: 5+1 rounds 
• Chamber Size: 3" 
• Finish: Black (Barrel & Receiver) 
• Stock Material: Synthetic 
• Sights: Fiber Optic Front Sight 
• Includes Accessories: Red Dot Optics, Chokes (5 included) 
   

Detailed Features 

• Inertia operating system cycles quickly with minimal recoil 
• Low-profile accessory rail accommodates red dot optics 
• Pistol grip stock for a secure hold during operation 
• Fiber optic front sight improves visibility in varying light conditions 
• At 6.75 lbs, it is manageable for extended shooting sessions

The EAA MC312 Sport gets generally positive marks for its price-to-capability ratio, with a few consistent reliability caveats that show up across reviews.

Clay shooting and waterfowl hunting are the most frequently cited uses, and owners generally find it performs well in those contexts. The red dot sight inclusion is called out as a practical bonus rather than a gimmick, and the five interchangeable chokes let shooters adapt to different loads. Ergonomics come up positively -- the gun sits comfortably for most shooters.

On reliability, there are enough cycling complaints with certain ammo types that it is worth noting. Some owners report that lighter loads cause feeding or ejection issues, which is a known characteristic of inertia-driven shotguns that prefer full-power loads. This concern does not dominate the discussion, but it comes up often enough to be worth knowing before buying.

Weight is mentioned both ways. A few shooters find 6.75 lbs heavy for an all-day carry, while others appreciate the mass as a recoil buffer. The value-versus-premium-brand debate shows up too -- the MC312 Sport is seen as a capable shotgun at an accessible price, but some buyers who prioritize long-term reliability mention moving toward higher-end alternatives.