solid aluminum handguns for movie props and toys

[RCS]

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

years ago an enterprising M1 rifle collector decided to have some steel solid no trap door buttplates made up
from a company, they were cast but shrinkage was not figured into the pattern. Consequently the screw holes
on the butt plates did not line up with the stock holes !