The M1 TTB (Tank Test Bed) was an experimental American prototype developed in the 1980s on an M1 Abrams chassis. Designed to drastically improve crew survivability, it featured an unmanned turret housing a 120mm M258 smoothbore cannon with a 44-round carousel autoloader. All three crew members were seated side-by-side in a heavily armored capsule inside the front hull, driven via video feeds.

In-game you can obtain it by crafting it from blueprints. It’s literally mini-armata but in t10. It has pretty good frontal protection and main difference from default M1 is autoloader.