Board Thread:General Discussion/@comment-172.114.39.247-20171020225251/@comment-25396609-20171020232955

Mercury's guns are actually the boots, not the legs. I believe the reason Yang's arm has a gun built in is because Ironwood knows she lost her original weapon during the fall of Beacon, and had his men account for the need for a replacement in the design.

Ironwood himself does not seem to have integrated weaponry in his prosthetic... half of his body.