I'm looking for a small compact say that I can put two or three ARs and short shotguns in to fit in a particular. Of my closet. It needs to be under 40 in preferably around 36 in tall and no more than 20 in wide.

I have looked at the secureit fast boxes and I'm looking for something like that that is a bit wider. I prefer mechanical lock but would go for something digital if I had to.

I'm looking for something more sturdy than a sheet metal box but it doesn't have to be a 14 ton Liberty safe. The height is the part I'm having a problem finding. Anybody have any recommendations around 36 in tall for a rifle safe?

Liberty

This might fit your requirements.  Our local Co-Op has a Winchester safe, bigger than your specifications, but $800 and 500 pounds.