I have seen the 410/45 colt hybrid barrels from I think Rossi, and maybe a couple others. I think this hasn't really flown because there's little point in shooting a 45 colt through a smoothbore. I have also heard people do this with 410/44-40. If you had a pump 410, like an 870, could you just have a custom barrel made? Rifled and chambered for 45 colt, it would make a pump 45 carbine from the receiver, mag, and stock of the shotgun. If the extractor etc. were compatible. Just an idea that popped into my head.
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