As you may already know in some countries it is not allowed to own a dry firing demilled Sterling. And thus not allowed to have a full magazine either - no bullets, not even fake ones. So instead of having the magazine that goes into my Sterling just an empty shell, I decided to make it look a bit more sci-fi, but still somehow realistic, and in a way that it can be returned to its original appearance immediately if wanted to. So I put inside the cut magazine some black foam I used to have from an airsoft pistol box, and then added some plastic thingies I got from a disposed plug, plus a furniture connector. The end result is this:
It can be taken off easily, and you can add back the original spring if wanted to. It looks much better than an empty magazine when you look at it.