If you are at all serious about shooting trap, buy an 870 Trap and a spare short bbl for it. The configuration you favor would not make a very good trap gun, wheras the trap gun serves both purposes well and the trap stock works better with rifle sights commonly found on a slug bbl than a field stock would.
Plus: it's against the rules to load more than two shells at a trap range and I think if you think you need an 8 rd mag for home defense I hope you are planning defending a helluva mansion. Get my drift? I can't imagine needing more than 2 shells for one intruder and let's be honest here: unless you're being assaulted by pros, once you fire the first shot or two, they're going out the door anyways. Maybe one or two more, but an 870 does have 4 shot capacity with 2-3/4 shells. So, I agree with SS. 870 trap with a spare short barrel will likely fill your bill. Good luck!
The problem with that from a practical point of view is that he will hopefully never have use for a HD gun and will do all of his shooting at targets. Therefore the main setup of a trap gun makes more sense.
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