Garry's Mod Model Format.

Sorry to bother this section again,
but what format does Garry’s Mod models have to be in?
Thanks in advance.

.mdl

not “garry’s mod models”, source engine models

ugh

You’ll have to compile the models from .smd (that you export from your 3d app) to .mdl.

Try searching for “compile” or “compiling” in this section for tuts.