What is this part called? And where to buy?

[Rottentofu]

What do you call this part of the magazine? I am trying to find a replacement part for it for my Shield magazine. (You probably read my post about how my Shield blew up)



The magazine doesn't look damaged. I can easily find a replacement floor plate, but I couldn't find a replacement for that part circled in red because I don't know what it is called.

Thanks in advance!

[naeco81]

It's called a floor plate insert or magazine lockplate.
I don't think you can source it online at a store, but you can contact S&W and they will probably send you one for free.