Editor recommended because this is the officially named Prestige Attachment for RAZOR 9MM. It is not labeled BEST. Tradeoffs are quoted from official launch copy.

RAZOR 9MM
Barrel12” MFS Sidewinder BarrelReach maximum Weapon Level and Prestige the weapon.
Aftermarket barrel that provides a massive bullet velocity improvement with a significant improvement to all aspects of recoil at the expense of handling.
Attachments 1
- Barrel12” MFS Sidewinder BarrelReach maximum Weapon Level and Prestige the weapon.
Aftermarket barrel that provides a massive bullet velocity improvement with a significant improvement to all aspects of recoil at the expense of handling.
Alternatives
- Base weapon / no prestige attachmentKeep the base gunsmith path if you do not want the official prestige tradeoff quoted above.
Evidence basis: Source
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Recommended · bo7-razor-9mm-prestige-launch