Does this have an adapter for 1.75 mini shells?

Hi Samuel, no adapter is needed with the 590S, it is made to fire mini shells without the adapter. Stay safe & have a great day!

This newer model 590S was made with mini shells in mind my friend. No Opsol mini shell adapter needed at all to run the mini's.

no adapter needed "590S models cycle 1.75"; 2.75" or 3" shells, interchangeably, without the need for an adaptor"

Hi Samuel and welcome. This model will handle mini-shells without the adapter. For other 500/590 Maverick 88 models you would need this adapter :https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish -- Cheers and stay safe!

According to Mossberg, "590S models cycle 1.75"; 2.75" or 3" shells, interchangeably, without the need for an adaptor. Pick one shotshell length, or simultaneously load any combination of the three. "

Is this Red Dot ready?

no but its drilled and tapped so you can easily mount a picatinny rail to install a red dot

Hi Samuel, it is not red dot ready, but it is drilled & tapped. You will need to add this picatinny rail to ad a red dot >>> https://www.amazon.com/Monstrum-Tactical-Mossberg-Shotgun-Picatinny/dp/B00ME8SZFS Stay safe & have a great day!

Hi Samuel and welcome. This model is Drilled and Tapped for Optics mounting. Cheers and stay safe!

Hice una búsqueda y vi que en estos modelos viene una capacidad de 8+1. Tengo dudas con este modelo ya que indica que hace 10+1. Cuál es la capacidad real de este modelo? Y se le puede colocar un extensor de magazine?

Karimar, el 590S puede ciclar 1 3/4" mini shells, por lo que la capacidad es de 9 + 1 con mini shells, 6 + 1 con 2 proyectiles de 3/4 "o 5 + 1 con proyectiles de 3 ". ¡Que tengas un gran día!

Karimar, Esta capacidad se indica mientras se usan las Mini Shells más cortas para una mayor capacidad. Las carcasas estándar dicen que 2 3/4 pulgadas serán 6 en el tubo y 5 en el tubo con carcasas de 3 pulgadas. ¡Salud y mantente a salvo!

I noticed this shotgun does not appear in my search results when I click "Ca approved". Any idea why it would not be approved in California?

Yes it is CA legal https://www.budsgunshop.com/feeds/state_reg/california_restrictions.pdf

Randy, yes Sir this is CA approved. Pump Action Shotguns do not carry the same restrictions as Semi-Auto Shotguns. details under Shotguns here : https://www.budsgunshop.com/feeds/state_reg/california_restrictions.pdf