In the Absolute Shounenverse when Yang had Lost her arm due to A Battle with Cinder that ended with it being separated from her Body Y/n had referred her to Tony Stark in her depression and with Tony knowing what it's like to be so depressed decided to Build her A New Arm.

The Arm  Looks completely different from the Mainline version as it is Far Bigger and Bulkier allowing for more Powerful Punches but also it has multiple Tech Upgrades such as slight Nano Machine enhancements to make it change Hand size in need of more technical situations and even A Repulsor Blast which allows Yang to shoot Ionized Blasts from the Palm of Her Hand, along with A New Equipable Gauntlet which has different Kinds of rounds Including Napalm rounds, Dust Rounds, and even Web Grenade Rounds Inspired by Spiderman.