How do I access weapon customisation?

As of April 13th 2025, Helldivers now have clearance to customise their weapons! 

Weapon customisation unlocks at Level 10.

Once players have reached Level 10, weapons can be customised by going to the Armory terminal within the Super Destroyer, selecting a weapon, and clicking Customise.  Weapons must be individually levelled by bringing them on missions. Customisations and attachments are unlocked via their level, and can be purchased using Requisition Slips.

Not all weapons will receive customisations, whereas other weapons may eventually receive customisations at a later date. 

Currently, only primary weapons can be customised.