The Trigger Control Unit (TCU) kit allows you to hook up your box mag to the HPA Engine (PolarStar) so it will automatically wind when the trigger is pulled. There is also a variation for the Wolverine FCU (due to different connection ports on the FCU).

The TCU is necessary to run our Cattle Drive Feeding System on your HPA. FCU's don't push enough juice to run our system, therefore this is needed to run an extra battery on our drum and inserts. 

These all come deans connected and our wiring diagram will help with set-up. Not a difficult application. 

Available for PolarStar and Wolverine systems.