Beta began existence as one of the Quintessons' many robotic slaves. She would not remain so. In the course of time she became a warrior, armed with a powerful crossbow weapon, and standing beside her partner A-3 she would be a leader in the rebellion that freed Cybertron from its Quintesson masters.
A simple disassemble, paint and minor tooling to the head/face. The crossbow was cast in resin from Strongarm's weapon.