Driger MS

Would Driger MS be better if I used Grip Flat Core instead of the original rc for it? Or should I use Grip Flat Core but the ultimate version?

Would it be better at all if I even changed the RC? Also what other parts would be better if they were changed except for the ar?
If you are able to get GFC or GFMUM then you should probably change the AR as well. Circle upper and Samurai Upper are leagues ahead it.
Yeah I know, but I like the attack ring alot, its not for very competetive purposes, just to make it own a little more. So I want to keep some of the original carp.
Then stick to GFC or GFCUM

Or Metal Change Core