Can anyone help ID this shotgun?

[STURM]

Can anyone help ID this shotgun? Thank you.

 

[Novascotiaboy]

I think it is a Mossberg 500.

https://joesalter.ca/products/mossberg-military-shotgun-500-atp-8-sp-

 

[Todjaeger]

Can anyone help ID this shotgun? Thank you.

It looks like a Mossberg 500 with an extended tube. Any other images available?

EDIT: Additional comment, it looks like newer production Mossbergs have a different grip.