Ok, The RezInject will put another file in ur CA account (exsmple with knife) named: GUNZ_T_PV_MELEE.rez or something, and the other file will be GUNZ_T_PV_MELEE.rezNEW)
aand yes with a NEW at the end, replce the normal file with the .rezNEW file and it will work : IN OTHER WORDS: REPLACE THE REZ WITH REZNEW) just look for it in ur CA folder