Toy Vault Inc.
All Weapon System cards are discarded after use. You do not automatically draw new a weapon system card after that.
There are only 4 ways to gain new Weapon System cards after the game begins.
1. Roll "Weapon System" face on the activation die.
2. Roll "Command" face on the activation die and use it to draw the Weapon System card.
3. Have a draw result during battle resolution.
4. Draw special cards such as System Reboot, or Command Jolt, where the card text specifically asks you to draw Weapon System cards.
This is correct, you never replace weapon system cards when used. This is another tactic you need to be aware of when playing. Keeping a good hand of Weapon System cards is vital to your success.