You have to find all the files of the gun, and the other.
then open it in HEXedit, copy everything in the gun you want to turn it into,
then delete everything in the gun you want to change, then paste.
Do it for all 5 files, some has only 4.
ex. copy everything in ANI_G_CX4STOM_CH, delete everything in L96A1_ANIBASE and paste the cx4storm codes.