A Gridfinity and Ammo Can compatible .223 round storage container. This is designed to store .223 rounds with stripper clips while remaining stackable. I’m able to fit two of these stacked in a generic metal ammo can with a standard Gridfinity 2.5 base plate, while leaving some space for accessories.

My ammo cans had a little raiser in the middle, so I’ve also attached a filler that will allow the bottom to be somewhat flat. I have no idea how standardized these are though so your mileage may vary with the filler.

Stripper clip and Seed loader from pictures: AR15_Speed _Loader

The source can be found at Onshape at Gridfinity Ammo Cans for your remix needs!