I fraps'd most of these replays on ArticGunz since the ijji replay system doesn't work with older replays anymore, but yes, all these replay were originally recorded on Ijji
Sorrow prob ucing
Amazon clip is kinda short, shots could be legit, but he floats so uc
nvcu uc mainly cause of that last shot lol
Dramatic prob ucing
Just from a quick look at video based off first clips. It's much easier to tell in-game though imo.
I don't think we can discuss private servers on the forums. I'd recommend sticking to this version of GunZ, but it's your choice.