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Chambered for 2-1/2" shells. Built with ATI's patented 410 gauge modular upper receiver, the Milsport 410 is the perfect shotgun for small game, large game, home protection and target shooting. Chambered for 2 1/2" .410ga shells, the Milsport 410 is a must have multi-purpose shotgun. Features: Gauge: 410 GA Capacity: 5 Magazines: 1 Barrel Length: 18" 13" Custom KeyMod Rail Finish: Black Action: Semi-automatic Sights: Flip-up 6-Position Rogers Super-Stock

Hi Larry and welcome. This .410 has a 2.5 inch Chamber and will fire 2 1/2 inch shells and not 3 inch. Cheers and stay safe! Full details here : https://americantactical.us/product/ati-milsport-sga-410-ga-18.5-bbl-shotgun-blk-6pos-stk-5rd-mag-gen-2#product_detail

2.5 inch ONLY

Larry, this is chambered for 2 1/2" shells only, it will not shoot 3" shells. Stay safe & have a great day!