Any idea what this shell trap door is called ?

[88 man]

Does anyone know what this is called ? It mounts on the bottom of a rifle stock to keep shells from falling out that are inside the stock. I've looked on the internet but not knowing what its called makes it hard.
Thanks !

 

[Evanguy]

Bottom metal or a floor plate?

 

[track]

It's a cartridge trap. AKA, trap door, bullet trap. Mostly utilized on European firearms from Germany and Austria.