Server operators should read this:

This model comes with the "hgrunt" and "ahl_hgrunt" versions.

They both have the exact same model/skin/animations, but for some reason, the server or client doesn't like to download the "hgrunt" version, and attempts to use the HLDM version of the model from the valve directory/pak file.  I suspect it's because it's the same name as the stock Valve model, which all players will have already, though not in their AHL directories.

If you choose to use this model in a map ini, use the "ahl_hgrunt" version, which seems to download and look just fine.

The "hgrunt" version is only here for players to download on their own, because at least one AHL map has it hard-coded into its teams.

-Varinger