/DG:ey guys I want you to introduce You to D4. He maybe just person with normal condition but no he was Amputated By D1 and D3 because there is a thing somewhat like concern worse than originium or stage 3 cancer so he has to lose his left arm. Fortunely D1 said he has a license to do a full fledge surgery and in addition, D3 added something that you may want it. Instead use of traditional plastic arm it was replaced with guns, yeah he can use guns as his left arm, it can be replace as well with any gun like AK, M4A1, A rocket luncher, Uzi, and etc.