Help with .LTBs

Ok, i extracted the GUNS_M_PV_AR, and i switched the anibase of the M14 and the K2 files to get a faster RoF. When i got ingame, the RoF was way faster, but instead of the M14 in my hands, there was a huge green blob and I couldnt see anything... Does anyone know what I did wrong?

You don't change the Anibase, anything that has ani or anibase leave it.