Are these the Aguila brand? And Mossberg says the gun will need the rubber adapter for the loading gate to use the mini-shells, but they don't say whether or not it comes with the gun.

I wouldn't hold my breath if I were you. Mossberg is being cagey about when they'll ship. Won't surprise me if it's April before they start showing up at distributors and dealers. Some places are saying there's a four to six month wait.