just rename them... like you want to make a m14 into a.. M4A1.. okay find all the M4A1 files, ALL of them type m4a1 in the search bar located in the top right corner, it'll give you a list of all of them, copy and paste all the m4a1 files to your desktop, remove the word m4a1 and put the word M14 inject to PV_T_AR and your done..