Also wouldn´t it be more fitting for her to use a 590 Mariner, rather than a regular Mossberg 500?
I think that is a 590 due to the bayonet lug, front sight, and heat shield. Although, really the 500 is practically the same as the 590, I can see the naval department short strapped on cash buying the 500 to save a couple hundred... then again if they wanted really cheap, you can't beat a $150 stevens pump-a-rum.