[macgybl]

The show used a few re-occuring characters that would pop up and play the same "type of character" but not necessarily the same person

For Example

John Considine who plays the typical con artist bad guy in many episodes.

"There but for the grace and the ep where Mac works as a immigrant farmer.

Any other similar roles/characters?

[MacGyverOnline]

I think you mean re-occurring actors who play similar characters?

This might help... Re-occurring actors

Hmmm interesting... Paul Batten played police officers or security guards in 4 different episode.

[macgybl]

wow, exactly what I was looking for.

Nice work

[MacGyverOnline]

No problem.

There's one there for characters who were played by different actors too.