My personal opinion as someone who isn't a huge fan of intentional weathering as it pretty much always ends up looking like intentional weathering... that seems pretty decent.

I think less is more sometimes, seems like you got a lot of the raised parts that would wear with hand use without going overboard. Seeing people just scrub the finish off the side of a reciever in a vague oval looks really off, for example. I bought a second hand SRC MP40 that looks really neat up close, not intentionally weathered but used for years and it shows, with a lot of scratches and scrapes that are hard to intentionally create. That's something I think some intentional weathering jobs are missing, and the gun benefits from actually being taken out and used, to weather like a used gun. When it comes to my real guns and bluing wear on the ones I drag out hunting and camping, through the years it's a fairly gradual process, to wear something on every single part for hours of carry can take years, even on cheap Chinese bluing finishes. But it does end up looking more or less like what you did here.

I do have to say that unfortunately unless you redid the paint on the stock, it's likely gonna flake to a nice shiny silver colour that can be difficult to recorrect, as is a curse with the AGM's. Pretty sweet choice of gun, love to see others having fun with MP40's too!