Interesting magazine I thought you might like to see
Not a valuable piece or factory but just a little know how from an old timer at some point. I can only assume this was made for hunting purposes or maybe shooting off a bench (which I highly doubt). It holds five rounds and functions perfectly, at least with the ammo I tried in it. The M2 makes very short work of it :)
https://www.milsurps.com/images/impo.../2pgbjlV-1.jpg
https://www.milsurps.com/images/impo.../Nm1U74Z-1.jpg
https://www.milsurps.com/images/impo.../nGhECvP-1.jpg