It's a legality thing all shot guns (as far as my knowledge) come with them out of the shop.
I've chucked every single one as soon as I got home accept the one in my 870 cause it was plastic and I saw them going for $30 online hah!
Edit: The way CA is going we might want to keep these being with out them they will probably be assault shotguns in a few years with out perm capped mag tubes
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