Out of the box the MC312 runs 12GA 23/4 3 and 3.5. We even tested target loads 12GA 23/4 and hot 3.5 mixed in the same mag tube and the shotgun still functioned. This is a very difficult task for most shotguns as it requires the bolt to cycle back far enough to load the 12GA 3.5 but using only the energy from a target load 12GA 23/4. We really abused this gun in testing. We ran 700 rounds continuous leaving no time to cool we mixed and matched ammo in a single mag tube and we put it through some of the most grueling tests we could come up with. We ran the first 5000 rounds with zero cleaning then ran a 10000 round endurance test without the replacing any parts. For the last test we dissassembled 5 shotguns placed the parts in a box mixed the parts up and reassembled the guns with a random selection. The MC312 fired with NO ADJUSTMENT NEEDED. - The GIRSAN MC312 even comes with a limited lifetime warranty. NO ONE puts a lifetime warranty on a shotgun EXCEPT GIRSAN and EAA CORP. - Gauge: 12GA - Barrel Length: 28 - Choke: SCREW - Overall Length: 50 - Length of Pull: 14.25 - Width: 1.5 - Type: INERTIA SHOTGUN Main Features Caliber: 12GA Gauge: 12 Gauge Action: Semi-Auto Barrel Length: 28" Capacity: 5 Sights: Fiber Optic Front Finish: Blue Weight: 6.95 lbs OAL: 52" Barrel Description: 28" Vent Rib Hand: Right Other Features Accessories: Red Dot Sight Application: Field Barrel Finish: Blued Barrel Length Range: 28" to 28.99" Caliber/Gauge: 12 Gauge Chamber: 3.5" Choke: Interchangeable Choke Chokes Included: 5 Finish Type: Blued Finishcolor: Matte Firearm Type: Shotgun Grip Type: Black Synthetic Includes: Red Dot Model: MC312 Goose Overall Length: 50" Receiver: Optics Ready Receiver Receiver Description: Optics Ready Receiver Receiver Finish: Blued Receiver Material: Aluminum Sights Type: Fixed Sights Size: Full Size Stock Finish: Black Stock Finish Group: Black Stock Material: SYNTHETIC Stock/Frame/Grips: Synthetic Stock Black Synthetic Units Per Box: 1 Weight Range: 6 lbs to 6.99 lbs Part Number: 390153 UPC: 741566905247

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