No. GunZ: The Duel was developed by MAIET Entertainment and published by Nexon exclusively for Windows PC. It was never ported to PlayStation 3, Xbox 360, or any other console.
If you love GunZ's fast-paced, acrobatic third-person shooter gameplay with wall-running, melee cancels, and stylish combat, consider these PS3 alternatives:
For the authentic GunZ experience, play on PC. Even a modest modern laptop runs it easily via Steam or the official client. The game's unique "K-Style" technique system and community-driven meta are PC-native phenomena that never translated to consoles.