I’m with kuduman
, I think it would make more sense on an autoloader, but I can’t say for sure until I get to shoot one. I’m thinking the box magazine will get in the way of my arm when I stroke the pump. The #1 malfunction that I see in quality pump shotguns is user error by “short stroking” the action. If this magazine causes folks to hold their arms out to the side to work the action, I could see it making this issue worse.
On an autloader this wouldn’t be an issue, of course.