Ok, extract the file: GUNS_M_PV_AR.rez.
Go to nexon\combat arms\game\GUNS_M_PV_AR
Find the Aug .ltb and the M16 .ltb.
Copy the Aug one, and delete M16 one*REMEMBER THE NAME OF M16 ONE!!!*
Paste the Aug one, and rename it to M16 one.
Then open Rezinject or whatever and select the GUNS_M_PV_AR.rez as the file to inject, then go to the files to add and select the M16 one.
Inject it.
Start CA.
Amaze yourself as the M16 is the Aug A3