The PA-MS1 exo-suit is BeskarMech's first attempt at anything of this kind.
BeskarMech tried to sell the prototypes to the Republic as a counter to the B3 Ultra Battle Droid, but the Republic weren't interested. Go figure.
This limited run of suits were stored in a secret facility under BeskarTech's headquarters for the time that MandalMotors owned it (without their knowledge).
As with other BeskarTech designs, they were brought out of retirement when the crab-boys arrived.
Covered in beskar mined before the Imperial rule, armed with gravity field generators like the B3 Ultra, the operators of these suits were able to decimate the small Vong forces that entered BeskarTech.