Description
Most people who get into 3-gun end up sending their shotgun off for loading port work, adding an optic rail, and swapping followers before it's ready to run. The Girsan MC312 Sport skips all that. It ships with an enhanced loading port already opened up for quad loading, a red mag tube follower so you can confirm an empty tube at a glance, and a wide-view red dot mounted on a low-profile Picatinny rail machined right into the receiver. That machined-in rail keeps the optic sitting low and solid, so there's no tall riser wobbling around after a few hundred rounds of buckshot.
Inertia-Driven and Built to Keep Running
The MC312 Sport runs on an inertia action with a rotating bolt, the same general operating style that made Benelli famous, and it stays cleaner than gas guns since fouling isn't getting pumped back into the works. The 3 inch chamber handles both 2-3/4 and 3 inch shells, and EAA has run these through extended torture testing with mixed loads stacked in the same tube. The 24 inch barrel wears a raised vent rib with a mid-bead and a large fiber optic front sight, which gives you a fast second sighting option when you'd rather swing on clays or steel with the bead instead of the dot.
MC312 Sport Ergonomics and Extras
The fixed pistol grip synthetic stock gives you a firm, consistent hold that a lot of folks prefer for fast transitions and one-handed manipulation during reloads, and a rubber butt pad takes the sting out of long practice sessions. Length of pull sits at 14.25 inches with an overall length of 46 inches. Capacity is 5+1, and the mag tube cap uses common thread dimensions, so extensions and other upgrades screw right on when you want more ammo on board.
Why the Girsan MC312 Sport Earns a Spot in the Safe
Whether you're stepping into your first match or you want a dedicated fun gun for the range, this one shows up with the work already done. Five choke tubes come in the box, so you can pattern it for everything from close hosing to longer slug and steel stages.
Key Specifications
- Manufacturer: European American Armory / EAA Corp (Girsan)
- Model: MC312 Sport
- Manufacturer Part Number: 390171
- UPC: 741566904400
- Gauge: 12 Gauge
- Chamber: 3 in. (accepts 2-3/4 in. and 3 in. shells)
- Action: Inertia-driven semi-auto with rotating bolt
- Barrel Length: 24 in.
- Capacity: 5+1
- Overall Length: 46 in.
- Length of Pull: 14.25 in.
- Stock: Black synthetic with fixed pistol grip
- Sights: Factory wide-view red dot, fiber optic front, mid-bead
- Rail: Low-profile Picatinny rail machined into receiver
- Finish: Matte Black
- Chokes: 5 screw-in choke tubes
What’s Included
- Girsan MC312 Sport 12 gauge shotgun
- Factory-installed wide-view red dot optic
- 5 screw-in choke tubes
- Owner's manual
Frequently Asked Questions
Does the Girsan MC312 Sport come with the red dot, or do I need to buy one separately?
The red dot comes installed from the factory on a low-profile Picatinny rail that's machined directly into the receiver. If you decide to run a different optic down the road, the rail accepts standard Picatinny-mount red dots, so swapping is simple.
Can the MC312 Sport shoot both 2-3/4 and 3 inch shells?
Yes. It has a 3 inch chamber, so it handles both 2-3/4 and 3 inch shotshells. Like most inertia guns, it cycles best with loads that have some authority behind them, so very light target loads may take a short break-in period before running at their smoothest.
Is the MC312 Sport really set up for 3-gun right out of the box?
That's the whole idea behind this model. The loading port is enhanced from the factory for quad loading, the red mag tube follower gives you a quick visual empty check, and the mag tube cap uses common thread dimensions so a tube extension installs easily. Add in the included red dot and fiber optic front sight and there's very little left to do before match day.
How does the inertia action on the Girsan MC312 compare to a gas-operated shotgun?
Inertia actions run cleaner because they don't vent gas and fouling into the receiver, which means less scrubbing between range trips and reliable cycling over long sessions. The trade-off is a bit more felt recoil than a gas gun, but the rubber butt pad and the gun's overall setup keep it manageable for high-volume shooting.




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