Saltwater60
20×102mm Vulcan
I like this for a home defense gun and if the mag limit and/or assault weapons ban is lifted I’ll be buying one with a few extra magazine. I think the price point is right.
www.gunsamerica.com

53-Rounds in 1 Magazine: Desert Tech's Quattro-15 -- SHOT Show 2023
This new lower receiver takes 53-round magazines and allows you to carry seven magazines worth of ammo in just four magazines.