Suppressor Replacement Parts are available on a "one for one" exchange basis only.  In accordance with ATFE regulations, individual suppressor parts can not be sold individually.  You MUST return your suppressor for any required repairs, which will be billed based on time and materials required.  

Serial numbered suppressor tubes CAN NOT be replaced per ATFE regulations.  In the event your suppressor is damaged and can not be repaired, you would have to purchase a new suppressor which would require a new tax paid Form 4 registration and transfer.