Zanoti Armor (319)232-9650 Cedar Falls, Iowa
Smallest unit is 60"H x 25"W x 20"D, weighs 350 pounds. Comes in 3 separate boxes, assembles with pins. In 8 or 16 long gun configurations. If you want to fireproof it you either add 5/8" drywall to the interior or place it in a 5/8" drywall enclosure.
The nice thing is, no one will know you have a safe in your apartment, since you assemble it in place from the 3 boxes and disassemble it to move it. Can be bolted to the floor.
Expect to look at the price in the $800-$1000 range.
No other gun safe has this break down/easy assembly feature.