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Unless you have access to a machine shop and you know what you are doing I would stay away from the Tanaka Works M870.
The real steel 870 is awesome, takedown is easy and the parts are steel awesomeness
Tanaka complicated the takedown and did a poor job for the installation of the inner barrel, if it's not aligned properly you will have a jam.
To remove the barrel you got to use tiny hex screws to remove two screws and there's another two on the sides of the receiver for the piece that holds the magazine tube, you lose those well the thing won't stay in place.
As for the internals, you can actually use a real steel trigger group you'll just need a 'thicker' face for the hammer.
The two vital parts that need to be custom made are the bolt and slide block.
I got my old one back after a year n a half and a piece of the slide block piece had broken off, without it it wouldn't push down on the carrier lever so it'd push a shell up to be loaded.
As for the bolt there are two little levers inside that whereas in real steel its one solid piece inside the bolt, those are made of pot metal and I don't know why they made the bolt itself plastic, probably so they could easilly drill holes for the ejector pin to stay in.
On real steel the ejector pin is screwed into the receiver whereas for the Tanaka it's into the bolt.
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