The Browning A500 was a semi-automatic shotgun produced by Browning Arms Company, not in Belgium. It was not known for having different models, but rather for its various configurations.

Here's what you need to know:

* Browning A500: This refers to the entire line of shotguns, not a specific model.

* Configurations: The A500 was available in a range of barrel lengths, stock types, and chamberings.

* Variations: The A500 was offered in the standard model and a "Maxus" model, which differed in some internal components, but were still considered the same gun with different features.

Therefore, it's more accurate to say that the Browning A500 was available in different configurations, rather than different models.