Description
The Girsan MC312 has built a reputation as one of the best values going in inertia-driven shotguns, and it earns that reputation the hard way. Before it ever hit shelves, Girsan ran these guns through 700 rounds fired continuously with no cool-down, 5,000 rounds with zero cleaning, and a 10,000 round endurance test without replacing a single part. They even stripped five shotguns down, dumped all the parts in a box, reassembled them at random, and the guns ran fine. That is the kind of proofing you usually only hear about from shotguns costing three times as much.
An MC312 That Feeds Whatever You Load
The 3.5 inch chamber is the real story here. Plenty of semi autos claim to run everything, but the MC312's inertia system will cycle light 2.75 inch target loads, 3 inch field loads, and full-power 3.5 inch magnums, even mixed together in the same magazine tube. That is a tall order for any autoloader, since the bolt has to travel far enough to feed a 3.5 inch shell while running on the modest push of a target load. For anyone who shoots clays in the summer and chases geese in the winter, that flexibility means one gun does it all. The inertia action also stays cleaner than a gas gun, so maintenance between hunts is quick and painless.
Girsan MC312 Field-Ready Details
The 28 inch vent rib barrel swings smoothly on crossing birds, and the high visibility fiber optic front sight picks up fast in low morning light. Five screw-in choke tubes come in the box, so you can pattern anything from close-flushing quail to pass-shooting ducks. The black synthetic stock and forend shrug off weather and briars, and at roughly 6.95 pounds the gun carries well on long walks. Capacity is 5+1, overall length runs 50 inches, and EAA backs the MC312 with a limited lifetime warranty, which is rare at this level. For a do-everything 12 gauge that will not flinch at hard use, this one is tough to beat.
Key Specifications
- Model: MC312
- Manufacturer: EAA Corp / Girsan
- MPN: 390145
- UPC: 741566903472
- Gauge: 12 Gauge
- Action: Inertia-Driven Semi-Auto
- Chamber: 3.5" (accepts 2.75", 3", and 3.5" shells)
- Barrel Length: 28" Vent Rib
- Capacity: 5+1
- Overall Length: 50"
- Weight: 6.95 lbs
- Stock: Black Synthetic, Fixed
- Front Sight: High Visibility Fiber Optic
- Length of Pull: 14.25"
- Finish: Black
- Warranty: Limited Lifetime
What’s Included
- EAA Girsan MC312 12 gauge semi-automatic shotgun
- Five screw-in choke tubes
- Owner's manual
Frequently Asked Questions
Will the Girsan MC312 cycle light target loads reliably?
Yes, and this is one of the MC312's strongest points. The inertia system was tested with 2.75 inch target loads mixed in the same magazine tube as 3.5 inch magnums, and it kept cycling. That said, like most inertia guns, it benefits from a short break-in period with heavier loads before feeding it the lightest promo ammo.
What choke tubes come with the MC312 and what thread pattern do they use?
The MC312 ships with five screw-in choke tubes covering constrictions from open to full, so you are set for everything from skeet distances to pass shooting. The tubes use the Beretta Optima thread pattern, which makes finding aftermarket and extended chokes easy since it is one of the most common patterns out there.
Is the Girsan MC312 good for waterfowl hunting?
It is a solid duck and goose gun. The 3.5 inch chamber handles heavy waterfowl magnums, the inertia action runs cleaner in wet, dirty conditions than most gas guns, and the synthetic stock handles weather without fuss. The 28 inch vent rib barrel and fiber optic front sight give you a smooth swing and a fast sight picture on passing birds.
How durable is the MC312 compared to more expensive inertia shotguns?
Girsan put this platform through some serious abuse before release, including 700 rounds fired back to back, 5,000 rounds with no cleaning, and a 10,000 round endurance test with no parts replaced. It borrows its design approach from proven Italian inertia guns at a fraction of the cost. EAA also backs it with a limited lifetime warranty, which speaks to their confidence in it.




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