Editor recommended because this is the officially named Prestige Attachment for VELOX 5.7. It is not labeled BEST. Tradeoffs are quoted from official launch copy.

VELOX 5.7
Barrel4” MFS Celeste BarrelReach maximum Weapon Level and Prestige the weapon.
Short Barrel that provides a strong improvement to movement speeds in addition to stronger improvements to in-air handling. Improves jumping and landing stability and weapon swap speed.
Attachments 1
- Barrel4” MFS Celeste BarrelReach maximum Weapon Level and Prestige the weapon.
Short Barrel that provides a strong improvement to movement speeds in addition to stronger improvements to in-air handling. Improves jumping and landing stability and weapon swap speed.
Alternatives
- Base weapon / no prestige attachmentKeep the base gunsmith path if you do not want the official prestige tradeoff quoted above.
Evidence basis: Source
For streamers: add this as an OBS Browser Source — stream widget
Recommended · bo7-velox-5-7-prestige-launch