Actually, the Mag 7 is a pump shotgun. I think the black forearm piece is either pushed up or forward. But I have the same concerns as you, which is why I'm wondering if those Aguila minishells would work in it. That would open up a few possibilities (aguila offers slugs as well as shot loads for their minishells), and assure a supply of ammunition.
I think if they don't work in it, it's next to worthless.
Ziggy
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