This one is for you 
Here we have the Remington 870 Special Purpose 12ga with the 3 round extended magazine tube. With a 7+1 capacity you should have plenty of stopping power for anyone coming after your shiny.
Below it you see the Northwest Territorial Mint 12ga shell. It has an overall weight of 7oz and is a nicely detailed piece. It chambers as a regular round would but ejections take some extra effort. The mint who made these are no longer in business but you can still find them floating around. Here are some pics.
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