In my humble opinion, beginners should avoid getting metal parts for their rotor heads and tail assemblies. I don't know how much of a difference they would make for the CP v3 in as far as stability (typically you want a larger rotor span and a higher head speed for an increase in stability). I use metal parts mainly to ensure a greater level of structural integrity in the head so as to prevent it from blowing up under stress, but I fly the Axe 400, and it has a higher head speed. The main reason I advise against metal parts for beginners is because they are expensive, and after repeated abuse, they cost much more than plastic parts. In a crash, something's gotta give; if it's not your metal parts, it'll be something else. Additionally, repeated crashes will warp your metal parts and cause them to be brittle and misshapen. You don't want that in your rotor head. If you're still learning, get a bunch of plastic replacement parts and keep practicing until you feel confident. When your crashes are few and far between, then it's alright to try out metal parts. I hear that they also help with precision, but I've never been able to see much of a difference in my heli when I went from plastic to metal. Anyway, this is just what I think. Someone else may have a good reason to get metal parts though