solid aluminum handguns for movie props and toys

[Flying10uk]

I am only guessing but sometimes the item in the mold will shrink - this of course depends on many factors.

Yes, that is why the "Pattern", normally made out of wood for sand casting, is made a little larger than the required finished size.

If they were "Die-Cast" I would have thought that they would have taken shrinkage into account when making the dies.