I am curious about the Mossberg 510 Super Mini bantam for home defense.

I can't find a whole lot about them, but I am thinking about one for my wife.

I'm thinking about a pistol grip, but am not sure if the standard mossberg grips fit on the 510 receiver. I'm also curious, if they make magazine tube extensions for the .410 lineup, as they only hold three shells in stock configuration.

I appreciate any insight, or alternatives.